Given the rationale, provide a reasonable question and answer. Step-by-step reasoning process: Quinn will read 2 books per week for 10 weeks so 2 * 10 = 20 books. If he reads 5 books, he gets a free donut. So if he reads 20 / 5 = 4 free donuts.
 The question and answer:
Quinn's library was hosting a summer reading challenge. For every 5 books you read, you a coupon for a free donut at a nearby bakery. Quinn decided he could read 2 books a week for 10 weeks total. How many free donuts would Quinn be eligible for?
The answer is 4