1. A board game contains 2 white coins, 6 yellow coins, and 15 black coins. How many coins are there in all?   2. Mr. Anderson borrowed from the library 3 books on Tuesday, 32 books on Wednesday, and 6 books on Sunday. How many books did he borrow altogether?   3. Mrs. Jackson delivered 23 letters in June, 33 letters in July, and 28 letters in May. 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 $ 24 . How many dollars did she spend?   5. Jack played for 4 hours, Greg played for 6 hours, and Edward played 9 hours more than Greg. How many hours did they play altogether?