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

Question

The average of 11, 12, 13, 14, and x is 13. The value of x is
$17$
$21$
$15$
None

A

17

B

None

C

21

D

15

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Solution

Verified by Toppr

$\frac{11 + 12 + 13 + 14 + x}{5} = 13$
$\frac{50 + x}{5} = 13$
$50 + x = 65$
$x = 65 - 50$
$x = 15$
Hence, the correct option is $C$

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