1. A board game contains 33 total coins. There are 2 yellow coins, and 7 red coins. How many coins are there of other colors?   2. The doctors at Get-Well Hospital drank 50 cups of tea yesterday. They drank 15 cups in the morning and 28 in the afternoon. How many did they drink in the evening?   3. Steve borrowed 10 books from the school library. He returned 4 books yesterday and 3 books today. How many books does he still have?   4. Mrs. Douglas had a lovely 38-piece crockery set. Last evening, 2 cups and 3 saucers broke. How many pieces of crockery left?   5. Warren had half an hour to do his homework. He spent 5 minutes on English and 5 minutes on Science. How many minutes remain?