A cookie recipe called for 2 1/2 cups of sugar for every 3/5 cups of flour. if you made a batch of cookies using 1 cup of flour, how many cups of sugar would you need?
Let's use ratio and proportion or rates If 2 1/2 or 5/2 cups of sugar=3/5cups of flour / ?=1 cup of flour 1/(3/5)*5/2=25/6 or 4 1/6 cups of sugar will be needed
