1. There are 31 cakes. Each cake is cut into 7 parts. Each part is further cut into 3 pieces. How many cake pieces are there in all?   2. The Professors at the State University drank 189 cups of tea yesterday. They drank 41 cups in the morning and 69 in the afternoon. How many did they drink in the evening?   3. Robin has a collection of 127 books. He donated 11 books last year and 23 books this year. How many books does he still have?   4. A school has 3 dining halls. Each dining hall has18 tables. If there are four children to each table, how many children stay for lunch?   5. Last month, Jack worked for 182 hours, Greg worked for 157 hours, and Edward worked 28 hours more than Jack. How many hours did they work altogether?