1. A board game contains 16 blue coins, 25 green coins, and 19 black coins. How many coins are there in all?   2. Mr. Lee borrowed from the library 19 books on Monday, 7 books on Tuesday, and 28 books on Thursday. How many books did he borrow altogether?   3. Mrs. Nelson delivered 33 letters in August, 29 letters in April, and 31 letters in May. 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 $ 28 . How many dollars did she spend?   5. Jack played for 2 hours, Greg played for 3 hours, and Edward played 6 hours more than Greg. How many hours did they play altogether?