1. There are 27 cakes. Each cake is cut into 6 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 120 cups of tea yesterday. They drank 31 cups in the morning and 20 in the afternoon. How many did they drink in the evening?   3. Michael has a collection of 175 books. He donated 18 books last year and 24 books this year. How many books does he still have?   4. A school has 3 dining halls. Each dining hall has36 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 153 hours, and Edward worked 27 hours more than Jack. How many hours did they work altogether?