1. A board game contains 91 blackcoins, 31 red coins, and 79 white coins. How many coins are there in all?   2. Simon has a small library at home. He has84 books on History, 65 books on Geography, and 79 books on Science. How many books does he have altogether?   3. Mrs.Young delivered 304 letters in February, 291 letters in November, and 280 letters inAugust. 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 $ 70 . How many dollars did she spend?   5. Last month, Jack worked for 165 hours, Greg worked for 138 hours, and Edward worked 20 hours more than Greg. How many hours did they work altogether?