If it takes 3/4 cup of flour to make 10 pancakes, how much flour will it take to make 40 pancakes

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If it takes 3/4 cup of flour to make 10 pancakes, how much flour will it take to make 40 pancakes?

Set up a proportion of flour to pancakes:
3/4/10 = x/40

3/4 is 0.75, so use our proportion calculator:
x = 3