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COCO
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COCO asked in 科學及數學數學 · 1 decade ago

難math 15點

Update:

sorry, d圖睇唔到某d字 請去 http://www.unl.edu/amc/b-registration/b1-archive/2...

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  • 1 decade ago
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    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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