The mean of $8, 10, x, 14, 16$ is $12$. Find $x$.

The mean of $8, 10, x, 14, 16$ is $12$. Find $x$.
  1. $10$
  2. $12$
  3. $14$
  4. $16$

Solution

$\dfrac{8+10+x+14+16}{5} = 12 \Rightarrow 48+x = 60 \Rightarrow x = 12$.

Asked in: IMO

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