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

The average o...

Question

The average of $11, 12, 13, 14$ and x is $13$ . The value of x is _____________.

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Solution

The correct option is C $15$
The average of $11, 12, 13, 14$ and $x$ is $13$
$∴$ $\frac{11 + 12 + 13 + 14 + x}{5} = 13$
$∴$ $50 + x = 65$
$x = 15$
Hence, correct option is $C$ .

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