1. A board game contains 9 green coins, 33 white coins, and 23 yellow coins. How many coins are there in all?   2. Mr. Young borrowed from the library 21 books on Thursday, 21 books on Sunday, and 15 books on Monday. How many books did he borrow altogether?   3. Mrs. Jackson delivered 28 letters in July, 25 letters in December, and 26 letters in June. How many letters did she deliver in the three months?   4. For her new kitchen, Mrs. Jackson bought a crockery set, a cutlery set and a pressure cooker. Each item cost $ 30 . How many dollars did she spend?   5. Jack played for 4 hours, Greg played for 9 hours, and Edward played 4 hours more than Greg. How many hours did they play altogether?