if 4 men can reap 40 acres of land in 15 days , how many acres of land can 16 men reap in 30 days ?
"4 men 40 acres 15 days 16 men ? 30 days 40 * 16 / 4 * 30 / 15 40 * 4 * 2 40 * 8 = 320 answer : a"
multiply(40, multiply(divide(16, 4), divide(30, 15)))