Answer:
8 3/4 cups
Step-by-step 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
