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by mre0979
Thu May 10, 2007 8:02 am
Forum: Volume 106 (10600-10699)
Topic: 10633 - Rare Easy Problem
Replies: 37
Views: 25034

The above proof is not intuitive to me, as I am poor in Maths, so I tried to work it out myself, and here's my way to solve it:

Let A be the original number, B be the final result,

according to the problem description,

A - (A-A%10) / 10 = B, e.g.
12345 - ( 12345 - 5 ) / 10
= 12345 - 1234 ...

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