The mean of $5, 10, 15, 20, x$ is $14$. Find $x$.
The mean of $5, 10, 15, 20, x$ is $14$. Find $x$.
- $15$
- $18$
- $20$
- $25$
Solution
$\dfrac{5+10+15+20+x}{5} = 14 \Rightarrow 50+x = 70 \Rightarrow x = 20$.
Asked in: IMO
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