Arecipe calls for 3/4 of flour per 1/2 tsp oil. how much flour is used per tsp of oil

I'm pretty sure that you just answered the question yourself. Reread what you wrote.

Since it is asking for how much flour PER teaspoon of oil you need to divide the given amount of flour (3/4) by the given amount of oil (1/2). 

3/4 / 1/2 = 3/4 x 2/ 1 = 6/4 = 3/2 

3/2 of flour per teaspoon of oil

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There is no association.