1. There are 20 cakes. Each cake is cut into 7 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 204 cups of tea yesterday. They drank 85 cups in the morning and 21 in the afternoon. How many did they drink in the evening?   3. Warren has a collection of 119 books. He donated 11 books last year and 29 books this year. How many books does he still have?   4. A school has 3 dining halls. Each dining hall has21 tables. If there are four children to each table, how many children stay for lunch?   5. Last month, Jack worked for 178 hours, Greg worked for 142 hours, and Edward worked 30 hours more than Jack. How many hours did they work altogether?