Answer:
9 cups of flour
Explanation:
since there's 15 cups of water and you need 3 cups of flour for every 5 cups of water 15 divided by 5 is 3 and 3 times 3 is 9 so there should be 9 cups of flour
9
if you have 5 for every 3 to get from 5 to 15 you multiply by 3 so now just multiply 3 by 3 to get 9
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