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Solving Equations with Linear Expressions on One Side and Numbers on the Other Side

If the arithm...

Question

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

A

10

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B

12

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C

14

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D

16

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Solution

The correct option is D 16
Since, Mean = $\frac{7 + 5 + 13 + x + 9}{5}$
$\Rightarrow 10 = \frac{34 + x}{5}$
$\Rightarrow 50 = 34 + x$
$\Rightarrow x = 16$
$∴$ Option D is correct.

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