Question

Bob can paint a house in 9 hours. Jim can paint it in 10 hours. How long would it take them to paint the house working together?​

Answer 1

Well they are 2 possible answers. 10 - 9, and 10 + 9. I don't know what answers you can choose, and what operation you use but those were the only I got. I'm sorry if this didn't help.

Explanation: