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Percentages

If 90 % of x ...

Question

Question 18

If 90 % of x is 315 km, then the value of x is
(a) 325 km
(b) 350 km
(c) 405 km
(d) 340 km

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Solution

Given, 90 % of x = 315 km
$\Rightarrow \frac{90}{100} \times x = 315 \Rightarrow x = \frac{315 \times 100}{90} ∴ x = 350 k m$

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