1. There are 26 cakes. Each cake is cut into 10 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 235 cups of tea yesterday. They drank 88 cups in the morning and 62 in the afternoon. How many did they drink in the evening?   3. Bill has a collection of 136 books. He donated 17 books last year and 27 books this year. How many books does he still have?   4. A school has 4 dining halls. Each dining hall has40 tables. If there are four children to each table, how many children stay for lunch?   5. Last month, Jack worked for 164 hours, Greg worked for 160 hours, and Edward worked 37 hours more than Jack. How many hours did they work altogether?