1. There are 20 cakes. Each cake is cut into 10 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 193 cups of tea yesterday. They drank 98 cups in the morning and 43 in the afternoon. How many did they drink in the evening?   3. Paul has a collection of 165 books. He donated 20 books last year and 29 books this year. How many books does he still have?   4. A school has 5 dining halls. Each dining hall has33 tables. If there are four children to each table, how many children stay for lunch?   5. Last month, Jack worked for 163 hours, Greg worked for 123 hours, and Edward worked 21 hours more than Jack. How many hours did they work altogether?