A recipe calls for one half cup of ingredient A for every 1 and two fifths cups of ingredient B. You use 4 cups of ingredient A. How many cups of ingredient B do you​ need?

Answer 1

1/2 cup = 0.5 cup

1 2/5 cup = 7/5 cup = 1.4 cup

Set up a ratio:

0.5 cup A/1.4 cup B = 4 cup A/x cup B

x = 11.2 cups of B