if 10 men can reap 120 acres of land in 15 days , how many acres of land can 20 men reap in 30 days ?
"10 men 120 acres 15 days 20 men ? 30 days 120 * 20 / 10 * 30 / 15 120 * 2 * 2 120 * 4 = 480 answer : e"
multiply(120, multiply(divide(20, 10), divide(30, 15)))