1. A board game contains 29 black coins, 24 white coins, and 12 green coins. How many coins are there in all?   2. Mr. Douglas borrowed from the library 21 books on Saturday, 17 books on Tuesday, and 30 books on Friday. How many books did he borrow altogether?   3. Mrs. Nelson delivered 26 letters in January, 33 letters in May, and 27 letters in July. How many letters did she deliver in the three months?   4. For her new kitchen, Mrs. Nelson bought a crockery set, a cutlery set and a pressure cooker. Each item cost $ 22 . How many dollars did she spend?   5. Jack played for 6 hours, Greg played for 9 hours, and Edward played 5 hours more than Greg. How many hours did they play altogether?