An owl needs two snakes a day to survive. A snake needs three mice a day to survive. How many mice are needed to support an owl for a day?

Well, it sounds like we've got a classic case of the food chain. If an owl needs two snakes a day and each snake needs three mice, then multiply the number of snakes needed by the number of mice each snake needs. So, two snakes times three mice equals six mice. Therefore, to support an owl for a day, you'll need six mice. But hey, at least the owl and the snakes aren't picky eaters, right?