The ratio of two numbers is a : b. If one of them is x then other is

\frac{a b}{x}

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\frac{b}{a x}

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\frac{b}{a + b} x

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\frac{b x}{a}

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Solution

The correct option is D $\frac{b x}{a}$
Let the required number be y
$a : b :: x : y$
$a \times y = b \times x$
$y = \frac{b x}{a}$

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