Difference of two numbers is $15$ and the larger is twice the smaller. The smaller is

Difference of two numbers is $15$ and the larger is twice the smaller. The smaller is
  1. $15$
  2. $30$
  3. $5$
  4. $10$

Solution

$2x - x = 15 \Rightarrow x = 15$.

Asked in: IMO

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