Question

Cookie recipes States for every 3 cups of flour, 1 & 1/2 teaspoons of vanilla are needed. how many teaspoons are needed for 5 cups of flour
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Answer 1

for every 1 cup of flour you use .5 teaspoon of vanilla. 
3/1.5=.5
so for 5 cups of flour you need 2.5 teaspoons of vanilla.
5*.5=2.5