Question

A muffin recipe calls for 2 1/2 cups of flour for every 2/3 cups of sugar. How many cups of flour should be used when 4 cups of sugar are used?

Answer 1

4 / (2/3)
4 * (3/2) + 12/2 = 6

6 * 2.5 = 15 cups of flour

Answer 2

Correction:

4 * (3/2) = 12/2 = 6

Answer 3

I agree with 15.