1. A board game contains 21 white coins, 15 green coins, and 8 red coins. How many coins are there in all?   2. Mr. Nelson borrowed from the library 32 books on Wednesday, 30 books on Monday, and 33 books on Friday. How many books did he borrow altogether?   3. Mrs. Moore delivered 23 letters in July, 30 letters in November, and 22 letters in December. How many letters did she deliver in the three months?   4. For her new kitchen, Mrs. Moore 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?