1. There are 12 cakes. Each cake is cut into 6 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 191 cups of tea yesterday. They drank 49 cups in the morning and 81 in the afternoon. How many did they drink in the evening?   3. Ronald has a collection of 121 books. He donated 17 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 has35 tables. If there are four children to each table, how many children stay for lunch?   5. Last month, Jack worked for 176 hours, Greg worked for 151 hours, and Edward worked 38 hours more than Jack. How many hours did they work altogether?