i know the answer is 27 but i have no idea why. can anybody explain it to me?
2007-09-28 18:01:13 · 13 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
27
each mouse eats 1 cookie in 3 hours. Therefore in 9 hours each mouse will eat 3 cookies. 3 * 9 = 27
2007-09-28 18:05:43 · answer #1 · answered by Anonymous · 0⤊ 0⤋
Firstly, 1 mouse will eat 1 cookie in 3 hour
so 9 mice will eat 9 cookies 3 hours
therefore 9 mice will eat 9 x 3 cookies in 3 x 3 hours
meaning that 9 mice will eat 27 cookies in 9 hours
2007-09-29 04:32:24 · answer #2 · answered by Matthew T 2 · 0⤊ 0⤋
3 mice eat 3 cookies in 3 hours, so 9 mice eat 9 cookies in 3 hours (3 times the mice would eat 3 times the cookies in the same amount of time). So in 9 hours they would eat 27 cookies.
2007-09-29 01:44:10 · answer #3 · answered by argusone 1 · 0⤊ 0⤋
It takes 3 mice 1 hour to eat a cookie. So split up the mice. Three groups of 3 mice. Each group will eat 1 cookie per hour. 3 groups x 1 cookie per hour x 9 hours= 27.
2007-09-29 01:08:26 · answer #4 · answered by KingTriage 2 · 0⤊ 0⤋
3 mice eat 3 cookies in 3 hours. so 3 mice eat 1 cookie in 1 hour, meaning that each mouse eats 1/3 of a cookie per hour. so in 9 hours, only 1 mouse will eat 9 times 1/3 which is 3 cookies. so 9 mice will eat 9 times 3, 27 cookies.
2007-09-29 01:07:15 · answer #5 · answered by Nilly 3 · 0⤊ 0⤋
Figure out how long it takes one mouse to eat one cookie.
From the first sentence you can determine that to be three hours.
Now do the math:
9 hours means 3 cookies for a single mouse. There are 9 mice, so 9 mice times 3 cookies each = 27
2007-09-29 01:05:34 · answer #6 · answered by Jim S 5 · 0⤊ 0⤋
We can use simple algebra for this one! Yay!
c/h - cookies per hour
To find this we look at the ratio of mice per cookie 1/1, so that means our c/h is 1/3. 3(hours) x 1/3 (cookies per hour) = 1 cookie. The formula looks like this...
H x c/h = C
H- total hours
c/h- cookies per hour
C- total cookies
but we have 9 mice so we would multiply our total by 9.
9 x 9 x 1/3=27
2007-09-29 01:56:39 · answer #7 · answered by Brandy A 3 · 0⤊ 0⤋
3 hour per cookies you got 9 hours totals eating time divided by 3
and time 9 mices (9/3)3=27
2007-09-29 01:19:20 · answer #8 · answered by ppe 5 · 0⤊ 0⤋
Two ways to think of it as
3 mice eat at a combined RATE of 1cookie/hour
if you have 9 mice and 9 hours
you have the initial "equation"
3 mice = 1cookie/hour
... but now you are tripling the number of mice (multiply by 3)
... and you have 9 hours (per/hour * 9)
... ... 3 * 9 = 27
2007-09-29 01:18:19 · answer #9 · answered by David F 5 · 0⤊ 0⤋
3 times as many mice for 3 times as long will eat 3*3=9 times as many cookies. Then
9*3 = 27
(Assuming the cat doesn't get them first âº)
Doug
2007-09-29 01:10:09 · answer #10 · answered by doug_donaghue 7 · 0⤊ 0⤋