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

C 12 I think

ReplyDelete(C) 12..

ReplyDeleteThe 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.