Marks of $5$ students are $40, 45, 50, 55, x$ and the mean is $50$. Find $x$.

Marks of $5$ students are $40, 45, 50, 55, x$ and the mean is $50$. Find $x$.
  1. $50$
  2. $55$
  3. $60$
  4. $65$

Solution

$40+45+50+55+x = 5\times 50 = 250 \Rightarrow 190+x = 250 \Rightarrow x = 60$.

Asked in: IMO

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