英语脑筋急转弯 求解答

英语脑筋急转弯 求解答
You have 10 beetles.You go and find more bugs to collect.By the time you finish,you have collected a further 20 to your original 10.how many beetles do you now have ?
Henry is a beggar. He has the habit of picking up cigarette ends left by other people. He can always make one new cigarette out of seven ends. One Saturday night he collected 49 cigarette ends. The next day he made them into cigarettes and smoked them all. How many whole cigarettes did he smoke that day?
Which letter best completes the series:A,D,H,M
Which one of the words below seen on a wall by looking in a mirror would look exactly as if you were looking at it directly?