Question: A vampire drains three people a week. His best friend is a werewolf who eats five people a week, but only fresh ones, never drained ones. How many weeks will a village of 72 people last them both? Think carefully first, then make a decision:
The vampire and werewolf need 3 + 5 = 8 people a week. A village of 72 people will last them both 72 / 8 = 9 weeks. So the answer is 9.