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Division in different bases 2021-02-06
Promise pose la question :
Simplify the following 302 in base6 divided by 5 in base6
Penny Nom lui répond.
400 in 7.5 billion 2019-08-28
Emma pose la question :
What is a better way to express 400 in 7.5 billion? My daughter has a rare condition, I want to know the answer to say “she is 1 in a ...”
Penny Nom lui répond.
7 spheres on a hexagonal tray 2019-01-14
herm pose la question :
what is the length of each side of a hexagonal tray, with the height of each side 0.75 inch, to hold seven spheres, each with a diameter of 3.00 inches? The spheres are placed such that each side of the hexagon is touched by one sphere at its midpoint (and the seventh sphere is place in the center of the "ring" of the other six spheres.
Harley Weston lui répond.
A sales tax of 7% 2016-12-07
Kenneth pose la question :
Hello:

If a sales tax of 7% is placed on every $1.00 of merchandise for sale, is it correct to indicate the tax as 7%/ per $1.00 or 7%/$1.00? If the calculation is expressed as 7%/$1.00 X $5.00, the tax is not $0.35 but 0.35. Is a tax rate of 7% incorrectly represented as 7%/$1.00 since the dollar unit cancels from the multiplication?

I thank you for your reply.

Penny Nom lui répond.
20 million as a percentage of 7.3 billion 2015-11-18
Nick pose la question :
Based on the estimate of the worlds current population (7.3 billion people), I'm trying to work out what percentage of that figure 20 million people would amount to?

(Apologies in advance that I've no idea if the 7.3 billion figure is an American Billion or UK billion)

Thanks for any help.

Nick.

Penny Nom lui répond.
A 4 by 7 array 2015-10-27
star pose la question :
don breaks a 4x7 array into a 2x7 array and another array.what is the fact for don's second array
Penny Nom lui répond.
Seven switches with 3 stages each 2015-09-15
jeff pose la question :
We are trying to solve a combination problem. If I have 7 things that can be in 3 states (say on/partially on/off), and all 7 have to a state. How many different combinations can there be? It doesn't seem like we should treat it as 21 independent things, but not sure how to break the problem apart.
Penny Nom lui répond.
Is 22/7 is an irrational number? 2015-06-07
Sayak pose la question :
Is 22/7 is an irrational number
Penny Nom lui répond.
A 7 person golf schedule 2014-02-21
Claude pose la question :
Golf Holiday: 7 guys, play a 4-some and a 3-some each day for 10 days. Want to have the best balance of each player playing with every other player the same number of times and each player playing in an equal number of 4-somes and 3-somes.
Victoria West lui répond.
A 7% solution 2014-01-14
imran pose la question :
what amount of H2SO4 should be added to make 5mL of 0.7% H2SO4 solution
Penny Nom lui répond.
12 golfers for 7 rounds 2013-09-25
Dennis pose la question :
I have 12 golfers playing a round of golf for seven days. How can I set-up teams so that everyone plays with everyone at least once in those seven days. Thanks!
Victoria West lui répond.
A schedule for 2, 7 team divisions 2013-09-24
Sampson pose la question :
I'm looking to set up a weekly schedule within a 22 week segment of 2 7 team divisions where every team plays every other team in their divison 3 times and have 4 cross over games with 4 of the other 7 teams in the other division. I've yet to figure this out. Thanks for your time.
Victoria West lui répond.
6 golfers in threesomes over 7 rounds 2013-09-24
David pose la question :
I have 6 golfers, (2 threesomes) who will be playing 7 rounds of golf. What is the best way to pair the 6 players so they play with as many different players over the 7 rounds?
Victoria West lui répond.
7 golfers, a threesome and a foursome 2013-09-04
Scott pose la question :
I'm leading a golf trip with 7 guys, and we're playing 5 rounds of golf together with a threesome and a foursome at each course..

I want to set up a schedule where each person plays at least two rounds with each of the other 6 guys.

Is that possible? I can't seem to find the right combinations.

Thanks for your help!

Victoria West lui répond.
The multiplication table for the different bases 2013-02-01
sylvia pose la question :
I am having a difficult time trying to figure out how to fill in the multiplication table for the different bases. i don't know how to get the numbers.
Penny Nom lui répond.
Golf for 17 2013-01-23
Richard pose la question :
I have looked through the examples on your site but can't find one that suits. I am fiddling with one to see if I can get a result; but not confident. I have 17 players playing 6 rounds in 3 groups of 4 and 1 group of 5. Two players will not be included in any 5 ball group. Can you help me please.
Victoria West lui répond.
A puzzle with a triangle and 57 2012-04-25
sharon pose la question :

Question from sharon, a parent:

We have been battling with this for days and cant find any solution -

Using each of the following numbers once, fill all the spaces in the triangles so that each side of the triangle adds up to 57

numbers are 11,12,13,14,15,16,17,18,19

diagram is -

      0      
    0   0    
  0   57   0  
0   0   0   0

 

Any ideas ? this has to be in in just over 24 hrs ......help!


Chris Fisher lui répond.
Golf for 17 2012-03-29
Richard pose la question :
Hi Guys,
I have a scheduling problem which I don't think you have covered before.
Apologies if you have!
I have 17 golfers due to play 4 rounds of golf.
Each round will consist of 3 threeballs and 2 fourballs (ie. 17 golfers in 5 groups)!
Is it possible to come up with a schedule where each golfer plays
with different partners in each round?

Robert Dawson lui répond.
A golf holiday 2011-01-04
Andy pose la question :
You kindly responded to a question I previously sent with regard to a Golf Holiday and I wonder if I might ask another question please. There are now 7 players playing 5 rounds of golf and I wonder if it is possible to devise a schedule where everyone plays with each other a minimum of two times i.e. they will play twice with some and three times with others. As always, many thanks for your kind assistance.
Victoria West lui répond.
6 rounds of golf 2010-11-29
Andy pose la question :
I wonder if you are able to assist me with scheduling pairings for a forthcoming Golf Tournament ?

There are 7 players and we will be playing 6 rounds - each round will be a 3 ball and a 4 ball. I am trying to work out a schedule that means everyone plays with each other roughly the same number of times. Also, we are looking to ensure everyone plays in roughly the same number of 3 and 4 balls. Any suggestions would be much appreciated - thank you.

Chris Fisher lui répond.
The difference of the two numbers 2010-02-15
Steve pose la question :
The difference of the two numbers 'abcdef ' and ' fdebca ' is divisible by 271. prove that b = d and c = e.
Claude Tardif lui répond.
Holiday for 7 golfers 2010-01-05
Andy pose la question :
I am having difficulty scheduling pairings for a forthcoming Golf holiday. There are 7 players and we will be playing 7 rounds - each round will be a 3 ball and a 4 ball. I am trying to work out a schedule that means everyone plays with each other roughly the same number of times (with a minimum of, say, 3 times if possible). Also, we are looking to ensure everyone plays in roughly the same number of 3 and 4 balls. Any suggestions would be much appreciated (we leave in 10 days time). Thank you.
Victoria West lui répond.
Sandra's age 2009-09-24
cindy pose la question :
Sandra is more than 20 years old and less than 60 years old. You can count by 7's to reach Sandra's age. Next year you will be able to count by 5's to reach Sandra's age. How old is Sandra?
Penny Nom lui répond.
A base 7 number and a base 9 number 2009-07-09
koteawarao pose la question :
Find a base 7 three-digit number which has its digits reversed when expressed in base 9.

ans: (281) base 7 and (182) base 9

Harley Weston lui répond.
7 digit combinations 2009-05-11
CAROL pose la question :
I NEED TO KNOW HOW MANY 7 DIGIT COMBINATIONS FROM 0-9 THERE ARE WITHOUT ANY REPEATES, OR WHAT THOSE COMBINATIONS ARE?
Penny Nom lui répond.
0123456789 2009-03-25
Dr. pose la question :
Many years ago I discovered that there are 33 numbers which, when multiplied by 0123456789, simply rearrange the digits. Surprisingly (to me at least) is the fact that the digits of all of those 33 numbers add up to one of the 6 "cardinal" numbers 1, 2, 4, 5, 7, and 8. For example 6 + 2 = 8 and 62 X 0123456789 = 7654320918 etc.
Another interesting (to me) fact is that only the cardinal numbers 1, 2, 4, 5, 7, and 8 rearrange the digits in the number 9876543210.
My question is: "Is this known to anyone but me and the people I have told?"

Robert Dawson lui répond.
7 golfers playing 4 days of golf 2009-01-30
Trish pose la question :
I have 7 golfers and we are playing 4 days of golf. I would like to do pairings so that everyone gets to play with each other at least one time. Can you help with this? Not a math whiz here and looking for help. Thank you.
Victoria West lui répond.
Ambitious 7th Grader 2009-01-28
John pose la question :
I have been asked to tutor a 7th grader who is very good in math. He is taking the most advanced course that his school offers to 7th graders. This course will cover Algebra 1 over a period of two years, using McDougal Littell's Algebra, Structure and Method, Book 1, a book I like a lot.

I have been hired not to help him with his schoolwork, which is too easy for him, but to guide him through something in math beyond his schoolwork. This was his idea, an idea which surprised his parents, but one which they support.

Do you have a suggestion for me? If so, I would be very grateful to hear from you. I think this could be a lot of fun for me and my new student, if I pick the right path.

Thanks and best regards, John John

Robert Dawson, Victoria West and Walter Whiteley lui répond.
Arrays of 72 marbles 2008-11-13
natalie pose la question :
draw four possible arrays for 72 marbles
Penny Nom lui répond.
A 7-digit odd number 2008-06-26
Godryk pose la question :
I am the smallest 7-digit odd number. my ones digit is the sum of my thousands, and ten thousands digits. What number am I?
Penny Nom lui répond.
How many combinations of 8614 are divisible by 7? 2008-01-22
Rebecca pose la question :
How many combinations of 8614 are divisible by 7 equally (with no remainder)?
Penny Nom lui répond.
Base seven 2007-05-19
Dan pose la question :
A number X is converted to base 7 and becomes a four digit number. Its leftmost digit is removed and written again as the rightmost digit. The number thus obtained is twice X. Find the decimal representations of all such numbers X.
Penny Nom lui répond.
A 3-digit number in base 7 has its digits reversed when expressed in base 9. 2007-01-28
Ashley pose la question :
A 3-digit number in base 7 has its digits reversed when expressed in base 9. Find this number.
Penny Nom lui répond.
Divisibility by 7 and 11 2004-10-13
Tammy pose la question :
I'm stuck in class in Yr 7 And I'm finding it hard on our new topic Divisibility! When I try to find out what this means on Internet sites i can not understand the used symbols like algebra and so on. I'm stuck on the divisibility rules for the number 11!
Penny lui répond.
Digits in the decimal expansion 2004-02-11
Leslie pose la question :
In the decimal expansion of 1/17 what digit is in the 1997th place?
Penny Nom lui répond.
37 with four 4'2 2004-01-03
Myra pose la question :
Using four fours and only four fours to get an answer of 37.
Claude Tardif lui répond.
Divisibility by 7 2003-11-14
A student pose la question :
how do you test a number to see if it is divisible by 7 or not?
Penny Nom lui répond.
The units digit of 57 to the 28th power 2003-09-01
Maria pose la question :

If 57 is raised to the 28th power, what must be the units digit in the result?

If you raise 7 to the 500th power, what is the numeral that will appear in the units digit position?


Penny Nom lui répond.
Making 7 2002-11-26
Bill pose la question :
At one time I had the answer to this math equation but I have lost it and can't seem to regain it. I may be going at it wrong but as I recall there were the numbers 1 through 4, and the std operators, +, -, /, *, and parentheses. The object was to make the four numbers with the operators equal to 7. Each number and operator may be used only once. My 9 year old loves these quizzes but I can't give it to her if I can't provide the correct answer.
Claude Tardif lui répond.
27 2001-09-10
Kacy pose la question :
In class we were given this problem. We have the numbers 30, 29, 19,11,26. these numbers = 27 in some way but how? the numbers can be applied any way using + - / X ( ) but can only be used 1 time each. can you please help me.
Claude Tardif lui répond.
The best of 7 2001-09-08
Michelle pose la question :
Professional basketball, hockey, and baseball championships are decided on the best 4 out of 7 games. The first team to win four games wins the championship. In how many possible ways could the team win the championship series after winning the first game?

 Example:  
Game   1    2    3    4    5     6     7         
Result W    L    L    W    W     W 

Leeanne Boehm lui répond.
1234567890 2000-09-14
Bradley Kloetzly pose la question :
Can you find two whole numbers, with the smallest possible difference between them, which when multipled together equal: 1234567890?
Harley Weston lui répond.
Rule of 78 2000-03-22
Dan Baumgarten pose la question :
Can you explain the rule of 78 and the reverse rule of 78? Thanks.
Claude Tardif lui répond.
Root 17 is Irrational 1999-01-21
John Murdock pose la question :
If you could help me out with this I would appreciate it. Prove that the square root of 17 is irrational.
Harley Weston lui répond.
 
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