1. There are 31 cakes. Each cake is cut into 9 parts. Each part is further cut into 2 pieces. How many cake pieces are there in all?   2. The Professors at the State University drank 134 cups of tea yesterday. They drank 34 cups in the morning and 80 in the afternoon. How many did they drink in the evening?   3. Ronald has a collection of 179 books. He donated 10 books last year and 25 books this year. How many books does he still have?   4. A school has 2 dining halls. Each dining hall has10 tables. If there are four children to each table, how many children stay for lunch?   5. Last month, Jack worked for 190 hours, Greg worked for 138 hours, and Edward worked 31 hours more than Jack. How many hours did they work altogether?