If $90 %$ of $x$ is $315 km$ , then the value of $x$ is

$325 km$

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$350 km$

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$405 km$

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$340 km$

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Solution

The correct option is B
$350 km$

Explanation for correct option
It is given that $90 %$ of $x =$ $315 km$
$\Rightarrow$ $\frac{90}{100} (x) = 315$
$\Rightarrow$ $x = 315 \times \frac{10}{9}$
$\Rightarrow$ $x = \frac{3150}{9}$
$\Rightarrow$ $x = 350 km$
Thus, the value of $x$ is $350 km$
Hence, the correct option is option(B) i.e. $350 km$

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