If the mean of $8, 12, 21, 42, x$ is 20 then the value of $x$

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Solution

Given data is $8, 12, 21, 42, x$
Their mean is $20$
$⟹ \frac{8 + 12 + 21 + 42 + x}{5} = 20$
$⟹ 83 + x = 100 ⟹ x = 17$

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