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Question

If $42 = 3 (x - 4)$ , what is the value of $x$ ?
$4$
$10$
$18$
$20$

A

4

B

18

C

10

D

20

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Solution

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Given, $42 = 3 (x - 4)$
$\Rightarrow 42 = 3 x - 3 \times 4$
$\Rightarrow 42 = 3 x - 12$
Add $12$ on both the sides,
$42 + 12 = 3 x - 12 + 12$
$\Rightarrow 3 x = 54$
$\Rightarrow x = \frac{54}{3} = 18$

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