1. A board game contains 20 blackcoins, 31 yellow coins, and 78 green coins. How many coins are there in all?   2. Hick has a small library at home. He has182 books on History, 121 books on Geography, and 58 books on Science. How many books does he have altogether?   3. Mrs.Buffet delivered 229 letters in June, 250 letters in December, and 324 letters inMay. How many letters did she deliver in the three months?   4. For her new kitchen, Mrs Hurt bought a crockery set, a cutlery set and a pressure cooker. Each item cost $ 67 . How many dollars did she spend?   5. Last month, Jack worked for 197 hours, Greg worked for 145 hours, and Edward worked 34 hours more than Greg. How many hours did they work altogether?