Problem: 10 men can cut 10 trees in 2 hours . if 2 men leave the job , how many trees will be cut in 3 hours ?
Rationale: 10 men - working 2 hrs - cut 10 trees 1 men - working 1 hr - cuts = 10 / 10 * 2 thus 8 men - working 3 hrs - cut = 10 * 8 * 3 / 10 * 2 = 12 trees answer is a
annotated_formula: multiply(multiply(subtract(10, 2), divide(divide(10, 2), 10)), 3)