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What percentage of the seniors polled yes? 2006-03-20
Jean pose la question :
An equal number of juniors and seniors responded to the question, "Do you like math?" Each respondent said yes or no. If 70% of those who said yes were seniors and 80% of those who said no were juniors, what percentage of the seniors polled yes?
Penny Nom lui répond.
A bill with a 15% tip and a 10% discount 2006-03-20
Tracy pose la question :
A $4500 bill is presented, without tax. 10% discount coupon. Add 15% tip with 3 people spitting for the sever.
Penny Nom lui répond.
Linear feet on a paper roll 2006-03-20
Vishal pose la question :
I WOULD WISH TO KNOW OF A STANDARD FORMULA BY WHICH I CAN CALCULATE THE LINEAR FEET OF A PAPER ROLL AS PER THE FOLLOWING DETAILS:-

THICKNESS: 150 GSM (GRAMS PER SQUARE METER)
REEL WIDTH: 85 CM
REEL DIAMETER: 140 CM
REEL INNER CORE: 10 CM
REEL WEIGHT: 946 KG's


Stephen La Rocque lui répond.
GCD 2006-03-20
Jana pose la question :
How can i prove: if gcd(a,b)=1 then gcd(a+b,ab)=1
Penny Nom lui répond.
Quarts, liters cubic yards and soil 2006-03-19
Kathy pose la question :
I am trying to find out how many quarts of dirt there are in a yard of dirt. The local flower store sells bags of dirt that are 20 quarts or 22 liters for $1.25 and another store sells a yard of dirt for $25.00. Which is the better deal?
Penny Nom lui répond.
The day of the week 2006-03-19
Neil pose la question :

A friend of mine has an excellent memory for dates and events that occurred on that date, but his party piece is the ability to tell you the day of the week that fell of any given date. This talent is all the more extraordinary because the answer comes back in less than 2 seconds (often under 1 second). By his own admission he is no mathematician.

Now his memory and knowledge are without question, but I challenged him that because of its diversity this party piece could not be based upon memory, but on mathematics. I believe that with the correct mathematical approach and the use of a common algorithm, anyone with a basic mathematical mind can do this in their head.


Chris Fisher lui répond.
The shape of an egg 2006-03-19
Vinson & Julie pose la question :
What is the proper mathematical term for the geometric solid that is represented by an egg?
Chris Fisher lui répond.
Gross profit as a percentage 2006-03-18
Mark pose la question :
How do I calculate the gross profit by percentage on and a product I purchased for $23.80 marked up 45% sold for $34.51 = profit of $10.71 GP by percentage????????
Penny Nom lui répond.
The square footage of an area in my backyard 2006-03-17
Kim pose la question :
I need to find out how to calculate the square footage of an area in my backyard that is in the shape of a "slice of pie". There are two sides that are straight lines that come together at the top to form a point, and then at the bottom is a curved line that joins the two other lines together. I need to figure out how to calculate the square footage that is inside the area.
Penny Nom lui répond.
Building a flower bed 2006-03-17
Bobby pose la question :
I am building a flower bed 60 ft long by 8 ft wide by 3 ft deep. How much dirt will it take to fill it with top soil/dirt.
Penny Nom lui répond.
9, 8, 7 and 2 in the game of 24 2006-03-17
Alana pose la question :
I just began student teaching in a 5th grade math class and found that the students play 24 in class, a game that I used to play in elementary school. The students choose a card which shows 4 numbers and then have to use any combination of addition, subtraction, multiplication, and division to reach 24. There was one card that we found that seems to have all of us stumped. The four numbers are 9, 8, 7 and 2. Can you figure out how to make 24 with those? Thanks so much for your help!
Claude Tardif lui répond.
A proof by contraposition 2006-03-16
Eban pose la question :

1)by mathematical induction prove that 12 + 32 + 52 + ...... + (2k-1)2 = (1/3)k(2k-1)(2k+1) for all positive integers k.

2)show that the contrapositive of the following statement is true. if 1 + M7 is even, then M is odd.


Stephen La Rocque lui répond.
If a circle is elongated into an oval .. 2006-03-16
Bruce pose la question :
If a circle is elongated into an oval, with constant circumference, does the area remain constant?
Walter Whiteley lui répond.
Back to the nines 2006-03-15
Victoria pose la question :

Can you answer this problem, does an answer exist?

  • Get a set of numbers 1-9 !
  • Using the whole set of nine number tiles (digits 1-9), try to arrange them to make three 3-digit numbers so that the sum of the first two is the third.
Can this be done without carrying over? If not can it be done without carrying over into the hundreds column?

Claude Tardif lui répond.
A 3-dimensional star 2006-03-15
Rachel pose la question :
I am trying to figure out the name of a figure that consists of 8 (I think) square pyramids. There is a net drawing of this figure somewhere and I can't find it because I don't know the name. When all 8 pyramids are connected, they form a '3-dimensional star'. We did this project when I was 14 years old and I am now a 27 year old teacher and I would love to do this project with my kids.
chris Fisher lui répond.
 
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