1. A board game contains 23 black coins, 31 blue coins, and 18 yellow coins. How many coins are there in all?   2. Mr. Jackson borrowed from the library 31 books on Thursday, 17 books on Saturday, and 26 books on Monday. How many books did he borrow altogether?   3. Mrs. Hurt delivered 22 letters in January, 30 letters in August, and 27 letters in April. How many letters did she deliver in the three months?   4. For her new kitchen, Mrs. Hurt bought a crockery set, a cutlery set and a pressure cooker. Each item cost $ 29 . How many dollars did she spend?   5. Jack played for 7 hours, Greg played for 9 hours, and Edward played 8 hours more than Greg. How many hours did they play altogether?