Give the step-by-step reasoning process and then the final answer. Kenny plans to mow lawns all summer, and then use the profits to buy video-games and books. He charges $15 per lawn. The video-games are $45 each. The books are $5 each. At the end of the summer he has mowed 35 lawns. There are 5 video-games he really wants, and then he will use the rest for books. How many books can he buy?
Kenny earns $525 because 35 x 15 = 525. He spends $225 on video games because 5 x 45 = 225. He has $300 left because 525 - 225 = 300. He can buy 60 books because 300 / 5 = 60.
The final answer: 60.