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MathNet 2012 Question 10

Math Olympiad Vault · MathNet 2012

Question 10

We have two boxes of balls, containing $m$ and $n$ balls, where $m,n\gt 0$. Two operations are allowed:
(i) Remove the same number of balls from each box.
(ii) Multiply the number of balls in one box by $k$.
Is it always possible to empty both boxes using these operations,
a) if $k=2$?
b) if $k=3$?