1. A board game contains 33 yellow coins, 16 blue coins, and 5 green coins. How many coins are there in all?   2. Mr. Lee borrowed from the library 18 books on Friday, 30 books on Saturday, and 22 books on Wednesday. How many books did he borrow altogether?   3. Mrs. Buffet delivered 21 letters in June, 23 letters in January, and 32 letters in May. How many letters did she deliver in the three months?   4. For her new kitchen, Mrs. Buffet bought a crockery set, a cutlery set and a pressure cooker. Each item cost $ 31 . How many dollars did she spend?   5. Jack played for 6 hours, Greg played for 2 hours, and Edward played 6 hours more than Greg. How many hours did they play altogether?