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

The mean of ...

Question

The mean of $x, x + 3, x + 6, x + 9$ and $x + 12$ is

x + 6

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x + 3

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x + 9

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x + 12

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Solution

The correct option is A $x + 6$
By definition,
Average $= \frac{x + (x + 3) + (x + 6) + (x + 9) + (x + 12)}{5}$
$= \frac{5 x + 30}{5} = x + 6$

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