# 難math 15點

圖片參考：http://www.unl.edu/amc/b-registration/b1-archive/2...

圖片參考：http://www.unl.edu/amc/b-registration/b1-archive/2...

圖片參考：http://www.unl.edu/amc/b-registration/b1-archive/2...

圖片參考：http://www.unl.edu/amc/b-registration/b1-archive/2...

圖片參考：http://www.unl.edu/amc/b-registration/b1-archive/2...

圖片參考：http://www.unl.edu/amc/b-registration/b1-archive/2...

ANSWERS: 4. ( E ), 15. ( A ), 17. ( B ), 18. ( D ), 22. ( E ), 25. ( D )

我有答案不過唔知點解 請解釋,plz!

### 1 Answer

- myisland8132Lv 71 decade agoFavorite Answer
4 The required number is 12394. So the digit of ten place is 9

15 After4 minutes, Homer eats 12 potatoes. the remaining potatoes is equal to 44-12=32. So, the potatoes which Christian peeled is 32*5/8=20

17 3/2=1.5 which is the smallest ratio among all possible choices.

18 the possible combinations are (1,5) (2,5) (3,5) (4,5) (5,5) (6,5) (5,1) (5,2) (5,3) (5,4) (5,6) => probability =11/36

22 the mark 97 should not be appeared since 19*5=95 and you cannot get 2 marks in 1 questions.

25 7425/3=2475 =>D

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