Question

One bunch of cookies requires two eggs in 2 1/2 cups of flour how many cups of flour you need to make 3 1/2 batches of cookies

Answer 1

8 3/4 cups

Explanation:

1 batch of cookies 3 1/2 batches

--------------------------- = ------------------------

2 1/2 cups flour x cups of flour

using cross products

1 * x = 2 1/2 * 3 1/2

changing 3 1/2 to an improper fraction ( 2*3+1) /2 = 7/2

changing 2 1/2 to an improper fraction (2*2+1)/2 = 5/2

x = 5/2* 7/2 = 35/4

changing back to a mixed number

4 goes into 35 8 times (4*8 = 32) with 3 left over

8 3/4 cups