A cookie recipe called for 2 1/2 cups of sugar for every 2/5 cup of flour. If you made a batch of cookies using 1 cup of flour, how many cups of sugar would you need?
1 cup of flour* (2 1/2 cups of sugar/ 2/5 cup of flour)= 6 1/4 cups of sugar.
(Note that the unit cancels out so you get the answer)
The final answer is 6 1/4 cups of sugar~