Kim buys 3 pizzas. They are 12 slices each. The pizza cost $72. How much did 5 slices cost? Think carefully first, then make a decision:
he got 3 * 12 = 36 slices. So each slice cost 72 / 36 = $2. So 5 slices would cost 5 * 2 = $10. So, the answer is 10.