If $2 : 9 :: x : 18,$ then find the value of $x .$

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Solution

The correct option is A
4

Given that $2 : 9 :: x : 18.$

$\Rightarrow \frac{2}{9} = \frac{x}{18}$
$\Rightarrow 2 \times 18 = 9 \times x$
$\Rightarrow 9 x = 36$
$\Rightarrow x = 4$

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