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	Two people are clapping their hands		2019-12-06
		Yukti pose la question : Two people are clapping their hands, but with different frequencies. Ramya claps her hands 17 times per 3 minutes, and Kumar claps his hands 31 times per 5 minutes. They start clapping at the same time. How many times does each one clap before they clap together at the same time again? Penny Nom lui répond.
	Packing chocolates in boxes		2019-07-22
		CHESKA pose la question : 1.levy can pack the chocolate bars either with 35 bars in a box,with 42 in a box, or with 49 in a box. what is the least number of chocolate bars that he has? 2. the blue light of a Christmas light blinks every 2 second. the red light blinks every 3 second and the yellow light blinks every 5 second. how many times will the three lights blink at the same tims in one hour? 3.a wooden straightedge can exactly measure an 825 cm rope, a675 cm rope, and 375 cm rope. what is the least possible length of the straightedge? how many times will it measure each rope? Penny Nom lui répond.
	Multiplies and factors		2018-02-24
		Lil pose la question : Is a multiple the same as a factor? Penny Nom lui répond.
	Four multiples of 10		2017-09-23
		Laudacir pose la question : Four multiples of 10 are added together.the total is a 3 digit number with three consecutive digits. What could the four number be? Penny Nom lui répond.
	3 consecutive multiples of 11		2017-07-22
		nisha pose la question : using the multiples formula shown at ypur site how can we solve finding 3 consecutive multiples of 11 whose sum is 363 Penny Nom lui répond.
	Two boys on the same route		2016-12-06
		Abbey pose la question : Starting from the same spot, one boy completed a route in 9 minutes and another boy completed it in 15 minutes. When will both boys be at the same starting point at the same time again? Penny Nom lui répond.
	An airplane schedule		2016-10-14
		Stephanie pose la question : Starting at 8:00a.m., a passenger plane leaves from an airport every 6 minutes and a cargo plane leaves every 7 minutes. When is the next time these kinds of planes will leave at the same time? Penny Nom lui répond.
	The difference between the ares of two rectangles		2016-06-09
		Ingrid pose la question : I am trying to help my son with an area question. I have the answer, from the solutions, but I cannot figure out how to teach him. Question: Two rectangles have lengths 13cm and 19cm respectively. Their total area is 376cm squared. If both their widths are whole numbers, what is the difference in their areas? I know that this is solvable once I determine the widths of the rectangles , but how do I go about finding that? Thanks for your help Chris Fisher and Harley Weston lui répond.
	n^2 is a multiple of 100		2015-03-30
		Rahul pose la question : I have to prove that n^2 is a multiple of 100 is necessary or Sufficient condition (or both) for n being multiple of 10 Penny Nom lui répond.
	Multiples		2012-05-28
		Kenneth pose la question : If I understand correctly , a multiple is a product of two numbers. For example some of the multiples of 6 are 6, 12, 18, 24, 30, etc. I just multiplied 6 by 1, 2, 3, 4, 5, etc. Are the multiples of a fraction, for example, 2/3, determined in the same way? Are they 2/3, 4/3, 6/3, 8/3, 10/3, etc., or are they instead, 2/3, 4/6, 6/9, 8/12, 10/15, etc.? Or do fractions have no multiples? Penny Nom lui répond.
	I started with Euler's identity and manipulated it		2011-11-14
		anonymous pose la question : I started with Euler's identity and manipulated it e^i*pi=-1 e^-i*pi=(-1)^-1 e^-i*pi=-1 e^-i*i*pi=(-1)^i e^--pi=(-1)^i e^pi=(-1)^i type it in in a calculator and you get e^pi=23.1406926... and (-1)^i=0.0432139183... What did I do wrong? Robert Dawson lui répond.
	Prove sin x = sin (pi - x)		2011-02-15
		Janet pose la question : Prove sin x = sin (pi - x) Penny Nom lui répond.
	x/200+x/400+x/600+x/800		2010-10-08
		Ashishthombre pose la question : step by step LCM of x/200+x/400+x/600+x/800 Penny Nom lui répond.
	Three cars		2010-08-30
		Anil pose la question : 3 cars are moving at speed of 4 kmph,5.5 kmph and 8 kmph in a circular track.The circular track has a distance of 11 km. What is the time taken for all the 3 cars to meet at the starting point ? Stephen La Rocque lui répond.
	Two problems		2010-05-27
		debbie pose la question : Question from debbie, a parent: hi, i have a daughter and she asked me a maths question I cannot solve. I was just wondering if you can give me the answers plus the working out so I could explain to my daughter, 1. The leftmost digit of a six-digit number N is 1. If this digit is removed and then written as a rightmost digit, the number thus obtained is three times N .Find N. 2. Four friends are racing together down a flight of stairs. A goes 2 steps at a time, B 3 steps at a time. C 4 steps at a time and D 5 steps at a time. The only steps which all four tread on are the top one and the bottom one. How many stairs in the flight were stepped on exactly once? Penny Nom lui répond.
	cos(x) = sin(x - 1)		2010-04-28
		alex pose la question : In the equation cos x = sin x-1 for -pi/2 A: solve for x graphically B: solve algebraically and prove the solution is correct. Alex Penny Nom lui répond.
	Two bus routes		2010-02-03
		kiyah pose la question : from 4:30 pm to 6:30 pm the route 1 bus stops every 12 min at the gym's bus stop. the route 2 bus stops there every 15 min. if both buses are now at the stop and schedule is kept, how long will it be before both buses will be at the stop again? Penny Nom lui répond.
	Dividing seashells among girls		2010-01-06
		Eileen pose la question : A group of girls collected some seashells from the beach. They tried to divided these seashells equally among them. If each girl received 8 seashells, they would need 5 more seashells. If each girl received 7 seashells, they would have 3 seashells extra. How many seashells did they collect from the beach altogether? Robert Dawson and Penny Nom lui répond.
	Common multiples of 36 and 48		2009-09-15
		Kamaldeep pose la question : Find the first 2 common multiples of 36 and 48. Penny Nom lui répond.
	Jogging and swimming		2009-09-11
		Brandon pose la question : Trevor swims jogs 3 days and swims every 4 days. How often does he jog and swim on the same day Leeanne Boehm lui répond.
	Investing in multiple accounts		2009-06-26
		Kenneth pose la question : Hello: If an investor has $1000.00 to invest in multiple accounts, and he wants a total return of 4%, is there one calculation that can be used to determine what these amounts could be even though there may be numerous amounts used as answers for most of the following examples? For example, Invest $1000.00 @ 2% and 5% for total return of 4%. Invest $1000.00 @ 2%, 3% and 5% for total return of 4%. Invest $1000.00 @ 2%, 3%, and 5% for total return of 4%. Invest $1000.00 @ 2%, 3%, 4% and 5% for total return of 4%. etc. Robert Dawson lui répond.
	Common multiples of 2 and 5		2009-04-23
		pat pose la question : what are the common multiples of 2 and 5, through 30, because i been working on it for hours Robert Dawson and Stephen La Rocque lui répond.
	2sinB=3tanA		2009-04-10
		Xanathax pose la question : ABC is a right-angled triangle. 2sinB=3tanA. Calculate the measure of angle A. Penny Nom lui répond.
	A rectangular open box		2009-03-21
		tina pose la question : An open box is to be made from a rectangular piece of tin by cutting two inches squares out of the corners and folding up the sides. The volume of the box will be 100 cubic inches. Find the dimensions of the rectangular piece of tin. Stephen La Rocque lui répond.
	Confusion in a multiple choice question		2008-11-14
		BJ pose la question : My son got this math problem which he could mostly solve. Here it is: The highest location in a certain country is 4525 m above sea level. The lowest point in the same country is 192 m below sea level. a) Find the difference of the two elevations. His answer: a-(-b)= a+b or 4525-(-192)= 4525+192=4717 m. No problem. b) A city is 2221 m above sea level. Is this elevation closer to the highest point or the lowest point? His answer: highest point because: 4525-2221= 2304 m (closest to the highest point) and 2221-(-192)=2221+192= 2413 m. (farthest to the lowest point). OK so far. But then he was given 4 choices for this question with no other information: a) 4717 m; lowest b) 4333 m; lowest c) 4333 m; highest d) 4717 m; highest What does it mean? What's the connection with the rest of the problem? Harley Weston lui répond.
	A multiple choice exam		2008-09-13
		Phalange pose la question : A multiple choice exam consists of 12 questions, each having 5 possible answers. To pass, you must answer at least 9 out of 12 questions correctly. What is the probability of passing if: a. You go into the exam without knowing a thing, and have to resort to pure guessing? b. You have studied enough so that on each question, 3 choices can be eliminated. But then you have to make a pure guess between the remaining 2 choices. c. You have studied enough so that you know for sure the correct answer on 2 questions. For the remaining 10 questions you have to resort to pure guessing. Harley Weston lui répond.
	sin(2x)/sin(3x)		2008-06-19
		matt pose la question : how does sin2x break down (not with identities) and how would sin3x be created. My prob. is sin 2x/ sin 3x and I want to know how the double(or triple angle) would break down. I want to be able to cancel out sins. Thanks! Harley Weston lui répond.
	How do you reduce an equation with multiple variables?		2008-04-30
		Jonathon pose la question : How do you reduce an equation with multiple variables? For example, if 3x + y = k(x-3), what would x be equal to? Penny Nom lui répond.
	LCM over 100		2007-12-09
		Aris pose la question : A teacher has more than 100 sweets. She thinks that if she give 6, 8 or 9 sweets to her students she will have no remaining in the case. What is the smallest number of sweets in the bag? Stephen La Rocque lui répond.
	6 consecutive multiples of 6		2007-11-11
		jeff pose la question : find 6 consecutive multiples of 6 whose sum is the least common multiple of 13 and 18 Penny Nom lui répond.
	13 year and 17 year locusts		2007-10-12
		stefan pose la question : how many years pass between the years when both 13 year and 17 year locusts are out at the same time? Penny Nom lui répond.
	Least Common Multiples		2007-09-20
		Aiyanna pose la question : What is The Lcm Of 3,7,and 8 Because my Teacher gave me That and he didnt even know the answer.... I Worked and worked but I Couldnt Find It..... Penny Nom and Victoria West lui répond.
	Guessing multiple choice answers		2007-07-24
		carla pose la question : You are taking a multiple choice quiz that consist in 3 questions, each question has 3 possible answers only one is correct. To complete the quiz you randomly guess the answer to each question . Find the probability of guessing exactly 2 answer correctly. b) at least to answer correctly . c)less than two answer correctly Stephen La Rocque lui répond.
	The lcm of polynomials		2007-05-31
		devin pose la question : x^3-8 , x^3-4, x^2+4x+4 Penny Nom lui répond.
	Triple angle tangent formula		2007-03-15
		sam pose la question : Hi I am trying to derive a triple angle formulae for tan. I know i need to use compound and double angle formulae but am finding it difficult to "clean" up my fraction to get the triple angle formulae can you show me a worked derivation?! thanks Penny Nom lui répond.
	Least common multiple		2006-11-08
		Melenie pose la question : I have a daughter in 5th grade she can't seem to grasp the concept of finding LCM's does anyone have a quick easy way for her to learn????? Stephen La Rocque lui répond.
	Least common multiple		2006-09-25
		A student pose la question : What is the LCM of 10,45 and 38? Stephen La Rocque lui répond.
	How many people are in the race?		2006-04-07
		Marty pose la question : You're in a race with 1/5 of the racers ahead of you and 5/6 of them behind you. How many people are in the race? Penny Nom lui répond.
	cos(3X)		2006-03-29
		Joshua pose la question : I'm having trouble proving that cos(3X)=cos3X -(cosX)(sin2 X) Penny Nom lui répond.
	The Least Common Multiple of two primes		2006-02-21
		Kristine pose la question : Is the Least Common Multiple to two prime numbers always their product? Why or Why not? Stephen La Rocque lui répond.
	GCF, LCM, primes and the ladder method		2006-01-07
		Linda pose la question : How would I teach both finding the GCF and LCM with prime factors...I recall the ladder method vaguely.??? Penny Nom lui répond.
	LCM		2005-12-12
		Alex pose la question : what is the LCM of 210 and 54 and the LCM of 42 and 126 Penny Nom lui répond.
	Least common multiple		2005-10-22
		Dayna pose la question : I'm stumped! I can't seem to come up with a least common multiple of 22 and 25. Is there one? Penny Nom lui répond.
	The lcm of 5, 3, 4, 7 and 2		2004-11-05
		Christine pose la question : what is the lcm of 5,3,4,7,2 Penny Nom lui répond.
	The lcm of 1 and -1		2004-11-03
		Nayiyan pose la question : I would like to know what is the LCM of (-1) and (+1) is. Penny Nom lui répond.
	GCD and LCM		2004-10-31
		Cartalina pose la question : how do you calculate the "positive difference between the GCF and LCM of two numbers"? Penny Nom lui répond.
	sin(3A)		2004-10-20
		A student pose la question : Express sin3A in terms of sinA and cosA. Penny Nom lui répond.
	The Parliament of the land of Achronia		2004-05-29
		Christine pose la question : The Parliament of the land of Achronia consists of two houses. The parliament was elected in 2003 for a period of six years beginning on Thursday, the 1st of January 2004, when the two houses had their first sessions. According to the rules, the meetings of the first house must occur every twelve days for the duration of the term, and the meetings of the second house must occur every eighteen days. For example, the second meetings of the first and the second houses were held on the 13th and 19th of January respectively. A new law can be passed on any day when both houses meet, except on a Thursday. On how many days can the parliament members pass new laws during this six year term? Penny Nom lui répond.
	Sin(3x), cos(3x) and tan(3x)		2004-01-28
		Jon pose la question : What is the identity for cos3x, sin3x, and tan3x? In class, we learned double angel identities and were asked to find out the identity to these three trig functions. If you can help, please do. Also, i know that the cos4x- sin4x is the same as cos2x. Is cos8x-sin8x = cos2x also true? Thank you.s Chris Fisher lui répond.
	Multiples of all four of the numbers 2, 3, 4, and 5		2003-02-11
		Stephanie pose la question : How many of the first 1000 positive integers are multiples of all four of the numbers 2, 3, 4, and 5? Penny Nom lui répond.
	Why is 5 divided by 1/7 greater than 5 divided by 2/3?		2002-11-19
		Elizabeth pose la question : Without performing the division, explain why 5 divided by 1/7 is a number greater than 5 divided by 2/3. Is the least common multiple of two prime numbers always their product? Why or why not? Diane Hanson and Penny Nom lui répond.
	sin 2x = cos 3x		2002-02-25
		Allan pose la question : solve: sin 2x = cos 3x Primary question: how do you handle the cos 3x? Paul Betts and Chris Fisher lui répond.
	Manufactures golf balls		2001-11-06
		Kevin pose la question : A company manufactures golf balls. Golf balls are each numbered consecutively 0 to 4, and then the numbering starts over with zero again. Every 12th golf ball is yellow. Every 8th golf ball is tested for defects. The company produces 120,000 golf balls in an eight-hour shift. A. How many yellow golf balls are tested for defects during the day? Explain your reasoning. B. How many of these yellow balls that are tested are imprinted with the numeral 2? Explain your reasoning. Penny Nom lui répond.
	Locusts		2001-10-08
		A parent pose la question : JOHN CONJECTURED THAT BOTH 13-YR.&17-YR. LOCUSTS CAME OUT THE SAME YEAR. ASSUME IT IS CORRECT. HOW MANY YEARS PASS BETWEEN THE YRS. WHEN BOTH 13 YR. & 17YR. LOCUSTS ARE OUT AT THE SAME TIME? EXPLAIN. NEXT, SUPPOSE THERE WERE 12YR.,14 YR.,& 16YR. LO- CUSTS,& THEY ALL COME OUT THIS YR. HOW MANY YRS. WILL IT BE BEFORE THEY ALL COME OUT TOGETHER AGAIN? Leeanne Boehm lui répond.
	GCD and LCM		2001-09-24
		David pose la question : Find the GCD adn LCM of the following numbers. Assume p 2 to the power p, 3 to power q, 5 to power r and 2 to power q, 3 to power r, 7 to power p Penny Nom lui répond.
	A four digit number		2001-02-17
		Dean pose la question : Need to find a 4 digit number that can be divided by 2, 3, 4, 5, 6, 7, 8, 9, and will always have a remainder of 1 in the answer. Penny Nom lui répond.
	Two number theory questions		2001-01-30
		Richie pose la question : i have two questions and they are: the product of three consecutive prime numbers is 7429. Find the product of the smallest and largest of these three integers. the least common multiple of two relatively prime positive integers, a and b, is 144. if a (a>or=2) is as small as possible, compute the value of b. Penny Nom lui répond.
	Is n^2 - 2 a multiple of n - 4?		2001-01-10
		John pose la question : Find all positive integers n so that n2 - 2 is a multiple of n - 4. Sukanta Pati lui répond.
	Why does division start from the left?		2000-05-24
		Salil Dave pose la question : Addition, subtraction and multiplications start with right most digit and proceed left, but division starts from left-most digits and goes right ... why? Harley Weston lui répond.
	Factoring, primes, GCF and LCM		2000-02-27
		Ruth Kroek pose la question : My son is in grade seven, he has to do a Factoring Booklet the areas covered are: Prime #'s Composite #'s Rainbow Factoring Finding Multiples (consecutive multiples) Finding GCF of 2-3 numbers uning Rainbow factoring Finding LCM of 2 numbers using consecutive multiples prime factor trees prime factor ladders finding GCF of 2 numbers using Prime number Method Although his text 'Math Power' gives some information, we are at a loss .. Penny Nom lui répond.
	Triple angle formula		2000-02-23
		Sara pose la question : Can one derive a triple angle formula for sine and cosine? If so, how? Chris Fisher lui répond.
	Least Common Multiple		2000-02-16
		Kathy Heath pose la question : The way I understand it is for 2,3,9 the least common multiple is 18. Am I right? If so, I guess the least common multiple for 3,4,7 is 105. Please let me know if I'm right so I can tell my daughter. Denis Hanson lui répond.
	Climbing stairs		1999-12-22
		Harman Chaudhry pose la question : Paul, Michelle and Michael all climb up 54 steps. Paul climbs the steps one at a time i.e. 1, 2, 3, etc. Michelle Climbs the stairs 2 at a time i.e. 2, 4, 6, etc. Michael climbs the stairs 3 at a time i.e. 3, 6, 9, etc. How many steps are used by exactly two people? Penny Nom lui répond.
	Jose and Arthur		1999-09-26
		Joel Hammer pose la question : Jose can run around the track in 40 seconds. Arthur runs with Jose but in the opposite direction. They meet every 15 second. How long will it take Arthur to make one trip around the track? Denis Hanson lui répond.
	A Multiple Choice Test		1999-08-31
		Cintra Ramnarine pose la question : I have ten questions. There are two multiple choice answers to each question. What are the chances of answering all questions correctly. Harley Weston lui répond.
	Sin 4A		1999-06-22
		Ryan Cochrane pose la question : If sinA = 4/5, and A is a first quadrant angle, find sin4A Harley Weston lui répond.
	Where three sequences meet.		1999-03-06
		Ali pose la question : My name is Ali and I am in the 5th grade. I have a math question: What is the least positive integer meeting each of the following conditions: Dividing by 7 gives a remainder of 4 Dividing by 8 gives a remainder of 5 Dividing by 9 gives a remainder of 6 Help! Denis Hanson lui répond.
	The Board Problem		1999-02-15
		Avery pose la question : Mr. Avery has 3-foot boards and 4-foot boards. If he puts the 3-foot boards in a line, they have the same length as the 4-foot boards put in a line. Altogether he has between 16 and 25 boards. How many 3-foot boards does he have? Jack LeSage and Penny Nom lui répond.
	Greatest Common Factor.		1998-01-09
		Percy Stribling pose la question : how do you figure out what the greater common factor is? Penny Nom lui répond.
	Two Questions		1997-08-28
		Faye Tan pose la question : I am a trainee teacher. I would appreciate it very much if you could help me solve the following two problems which I think are meant for students at middle grade. 1. If a hen and a half lays an egg and a half in a day and a half, how many hens are needed to lay a dozen eggs in one day? 2. There are fewer than 200 passengers on a train. If they get off in pairs, one passenger will be without a partner. If they get off in groups of 3 or 4, there will still be one passenger left by himself. However, if they get off in groups of 5, no one will be left by themselves. How many passengers are there on the train? Penny Nom lui répond.
	How many digits are there in 2^2520?		1996-10-07
		Rita Leung pose la question : A)The number 64 is a sq., a cube, and a sixth power because 64=8*8, 4*4*4, 2*2*2*2*2*2. Find the smallest integer greater than 1 that is a sq., a cube, a 4th, 5th, 6th, 7th, 8th, 9th and 10th power. I have found that the answer is 2 to the power 2520th. B) How many digits are in the correct answer to part A? The answer is uncertain. It is either 758 or 759. Can you give me any ideas? Penny Nom lui répond.

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