Brain Teasers
Cats and Dogs
Mad Ade's family has dogs and cats as its pets. At every meal the pets eat 32 cookies. The dogs eat 5 cookies each and the cats eat 4 cookies each.
How many dogs and how many cats does Mad Ade's family have?
How many dogs and how many cats does Mad Ade's family have?
Answer
4 dogs (eating 4 x 5 or 20 cookies) and3 cats (eating 4 x 3 or 12 cookies).
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Comments
oooo kkkk
ok,
Yea, but how did you get there? I could not figure out what equation you would have used to get this.
It's trial and error
that was alot of fun, and was very easy to solve, 5 dogs ate 4 cookies which equals 20 and then 3 cats eating 4 cookies is 12, giving the total of 32 cookies
Good one Mad Ade
Good one Mad Ade
Dec 13, 2007
It doesn't have to be trial and error. Write the problem as a graphic equation with two variables with x being the number of dogs and y being the number of cats:
5x + 4y = 32 or
y = -5/4x + 8
In this case, you know that x and y have to be whole numbers because they represent whole animals, so x must be a multiple of four. Four, in fact, is the only answer that makes sense. Any larger, and the number of cats becomes negative.
5x + 4y = 32 or
y = -5/4x + 8
In this case, you know that x and y have to be whole numbers because they represent whole animals, so x must be a multiple of four. Four, in fact, is the only answer that makes sense. Any larger, and the number of cats becomes negative.
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