Since it takes 2 cups of cocoa and 1 cup of sugar to make 9 brownies, we can set up a proportion to find out how many cups of cocoa and sugar it would take to make 81 brownies.
Let x represent the number of cups of cocoa and sugar needed to make 81 brownies.
According to the proportion, we have:
2 cups of cocoa / 1 cup of sugar = 9 brownies / x cups of cocoa and sugar.
Using cross multiplication, we can solve for x:
2 * x = 1 * 81
2x = 81
Now, we can solve for x:
x = 81 / 2.
x = 40.5.
Therefore, it would take 40.5 cups of cocoa and sugar to make 81 brownies.
If it takes 2 cups of cocoa and 1 cup of sugar to make nine brownies, how many cups of cocoa and sugar, would it take to make 81 brownies
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