20 men can cut 30 trees in 4 hours . if 4 men leave the job , how many trees will be cut in 6 hours ?
"20 men - working 4 hrs - cut 30 trees 1 men - working 1 hr - cuts = 30 / 20 * 4 thus 16 men - working 6 hrs - cut = 30 * 16 * 6 / 20 * 4 = 36 trees answer is b"
multiply(multiply(subtract(30, 4), divide(divide(20, 4), 20)), 6)