Question

Water for irrigation is measured in acre-feet. One acre-foot is the volume of water that would coverone acre of land to a depth of one foot. How many acre-feet of water would it take to cover 600 acres to a depth of one inch?

Answer 1

600/12 = 50

Answer 2

600 acres would require 600 acre-feet if you want a depth of one foot (12 inches), but you only want 1/12 of that depth.