Prof. Giray Okten

Tuesday, February 17, 2009

Week 2 - Problem 5

Bill thought of an integer number. Nick multiplied this number either by 5 or by 6. John added either 5 or 6 to Nick’s result. Last, Andrew subtracted either 5 or 6 from John’s result. The final result obtained was 73. What was Bill’s number?

A) 10 B) 11 C) 12 D) 14 E) 15

2 comments:

  1. (C) 12..
    The final answer is 73, the one before this is either 78 or 79, one before these is either 72 or 73 or 74. But none of these 3 numbers are product of 5, but 72 is product of 6 (6*12), and so the answer is (C)12.

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