If it takes 2 cups of cocoa to make 9 brownies how many cups does it to take to make 81 brownies?

Answer 1

If it takes 2 cups of cocoa to make 9 brownies, we can set up a ratio to find out how many cups it takes to make 81 brownies.

2 cups cocoa/9 brownies = x cups cocoa/81 brownies

Cross multiplying, we get:

9x = 2 * 81
9x = 162

Dividing both sides by 9, we get:

x = 162/9
x = 18

Therefore, it takes 18 cups of cocoa to make 81 brownies.