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 Maths is rather fun (有趣).you know. The problems and puzzles are often very i 1      . Would you like to have a try? Now here is a q 2      for you. Three men had a m 3       in a restaurant. After the meal，the waiter brought them a bill for thirty dollars. Each man g 4      the waiter a ten dollar note. The waiter then took the thirty dollars to the cash-desk(收款臺). The bill was only twenty-five dollars,so he t 5      five dollars back to the three man. But the three men could not divide(分)the five dollars a 6      them.

“Let’s give the w 7      two of the five dollars,” said  one  of  the men.    “Then  he  can  give  us one dollar e 8      .    ”

The other two men agreed to this,and so each man received only one dollar from the waiter. This means that each man p 9      nine dollars for his meal. The waiter k 10      two dollars. Three times(乘)nine is twenty-seven,plus(加)two is twenty nine.

Where is the other dollar then?

1.        2.      3.       4.      5.        

6.        7.      8.       9.      10.       

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