1. There are 3 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 54 cups of tea yesterday. They drank 21 cups in the morning and 8 in the afternoon. How many did they drink in the evening?   3.   Ronald   borrowed 9 books from the school library. He returned 2 books yesterday and 3 books today. How many books does he still have?   4. For her new kitchen, Mrs. Sarah bought a crockery set, a cutlery set and a pressure cooker. Each item cost $ 33 . How many dollars did she spend?   5. There are 4 paintings on each of three walls of a room. If an art gallery has 8 such rooms, how many paintings are there in its collection?