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A recipe uses 2 cups of sugar to make 32 brownies. How many cups of sugar are needed to make 72 brownies?

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Set up a fraction with 2 cups of sugar (s) at the top and 32 brownies (b) at the bottom. 2s/32b. Now, set up the next fraction with x cups of sugar (because we don't know the amount of sugar) at the top and 72 brownies (b) at the bottom. Set them equal. Your equation should be 2s/32b=x/72b. Cross multiply these values (if you wrote them down; 32x=144) and solve for x.
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