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If the Arithmetic mean of 7, 5, 13, x and 9 is 10, then the value of x is

A. 10 B. 12 C. 14 D. 16 Answer: Option D
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Solution(By Apex Team)

Arithmetic mean of 7, 5, 13, x and 9 = 10 $\begin{aligned}&\Rightarrow\frac{7+5+13+x+9}{5}=10\\ &\Rightarrow34+x=10\times5\\ &\Rightarrow34+x=50\\ &\Rightarrow x=50-34\\ &\Rightarrow x=16\end{aligned}$

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