Question 5
If 90% of x is 315 km, then the value of x is
(a) 325 km
(b) 350 km
(c) 350 m
(d) 325 m

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Solution

(b) We have 90% of x = 315 km
$\Rightarrow \frac{90}{100} \times x = 315 \Rightarrow x = \frac{315 \times 100}{90} = \frac{315 \times 10}{9} = 350 \Rightarrow x = 350 k m$
Hence, option (b) is correct.

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