Question

if the mean of 6,8,9,x and 13 is 10 then find the value of x.

Answer 1

$mean = \frac{sum \: of \: total \: terms}{no. \: of \: terms} \\ 10 = \frac{6 + 8 + 9 + x + 13}{5} \\ 50 = 36 + x \\ x = 50 - 36 = 14 \\ x = 14$
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Answer 2

$mean = \frac{6 + 8 + 9 + x + 13}{5}$
$\frac{6 + 8 + 9 + x + 13}{5} = 10 \\ 6 + 8 + 9 + x + 13 = 50 \\ \\ x = 50 - 36 \\ x = 14$