1. A board game contains 70 whitecoins, 69 black coins, and 47 red coins. How many coins are there in all?   2. Martin has a small library at home. He has195 books on History, 20 books on Geography, and 123 books on Science. How many books does he have altogether?   3. Mrs.Nelson delivered 307 letters in February, 285 letters in November, and 268 letters inAugust. How many letters did she deliver in the three months?   4. For her new kitchen, Mrs Anderson bought a crockery set, a cutlery set and a pressure cooker. Each item cost $ 57 . How many dollars did she spend?   5. Last month, Jack worked for 185 hours, Greg worked for 157 hours, and Edward worked 37 hours more than Greg. How many hours did they work altogether?