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Three person buying something by 30, each pay 10, after a while, the owner making a discount of -5, but he realize that 5/2 is not good, so, he will return 1 for each, and gives the remaining (2) to his child, now:

  1. each person paid 9: 3*9 = 27
  2. Other remaining within owner's child: 2
  3. SUM: 27 + 2 = 29!

My Question is: where is the remaining (1)? is there any logical error in this question?

Andrés E. Caicedo
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Akam
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    Duplicate of http://math.stackexchange.com/q/15524/264 – Zev Chonoles Mar 10 '13 at 07:47
  • sorry, but the story can be re-writted in different ways, so, It's not easy to find similar questions... – Akam Mar 10 '13 at 07:49
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    There is no error in this question.The question is framed in such a way to make the readers come to wrong conclusions.Out of the $ 27$ paid $25$ (payment) $ + 2$ (to the child) and the remaining $ 3 $ is given back to the $3$ persons.This makes the total$ 30. $ – lsp Mar 10 '13 at 07:50

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Yes, there is a logical error. You should subtract 2 from 27, not add 2, to get 25, the final price. If you want to count the 30 paid initially, then it's just 10*3, nothing else.

einpoklum
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