1. A board game contains 20 total coins. There are 16 blue coins, and 2 green coins. How many coins are there of other colors?   2. The doctors at Get-Well Hospital drank 57 cups of tea yesterday. They drank 22 cups in the morning and 17 in the afternoon. How many did they drink in the evening?   3. Bill borrowed 9 books from the school library. He returned 2 books yesterday and 4 books today. How many books does he still have?   4. Mrs. Brown had a lovely 47-piece crockery set. Last evening, 5 cups and 3 saucers broke. How many pieces of crockery left?   5. Adam had half an hour to do his homework. He spent 6 minutes on English and 10 minutes on Science. How many minutes remain?