1. There are 30 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 194 cups of tea yesterday. They drank 70 cups in the morning and 68 in the afternoon. How many did they drink in the evening?   3. Herbert has a collection of 169 books. He donated 15 books last year and 20 books this year. How many books does he still have?   4. A school has 2 dining halls. Each dining hall has14 tables. If there are four children to each table, how many children stay for lunch?   5. Last month, Jack worked for 172 hours, Greg worked for 137 hours, and Edward worked 28 hours more than Jack. How many hours did they work altogether?