1. A board game contains 98 yellowcoins, 72 black coins, and 62 blue coins. How many coins are there in all?   2. Nelson has a small library at home. He has121 books on History, 176 books on Geography, and 67 books on Science. How many books does he have altogether?   3. Mrs.Gates delivered 280 letters in December, 279 letters in April, and 270 letters inMay. How many letters did she deliver in the three months?   4. For her new kitchen, Mrs Jackson bought a crockery set, a cutlery set and a pressure cooker. Each item cost $ 62 . How many dollars did she spend?   5. Last month, Jack worked for 180 hours, Greg worked for 144 hours, and Edward worked 35 hours more than Greg. How many hours did they work altogether?