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Find the value of x if it is given that 30% of 140 = x% of 840.

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answer is A.

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Detailed Solution

Concept- x percentage of number is

x^{th}

part of that number per hundred,we can use these concept to find the solution
30% of 140 = x% of 840

\frac{30}{100} \times

140=

\frac{x}{100} \times

840
42 = 8.4x
x =

\frac{42}{8.4}

x =

\frac{42 \times 10}{84}

x = 5
Hence, the correct option is 1

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