Question

12% of a sum of money is 42.what is 20% of the same sum.
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Answer 1

Answer:

$\frac{12x}{100} = 42 \\ 12x = 4200 \\ x = \frac{4200}{12} \\ x = 350 \\ 20\%of350 \\ \frac{20 \times 350}{100} \\ = 70$

Answer 2

Let the sum of money be x.

$12\% \: of \: x = 42$

$\frac{12}{100} \: of \: x = 42$

$\frac{3x}{25} \: = 42$

$3x = 42 \times 25$

$x = \frac{42 \times 25}{3}$

$x = 14 \times 25$

$x = 350$

Now,

$20\% \: of \: 350$

$\frac{20}{100} \times 350$

$2 \times 35$

$70$

Therefore, 12% of 350 is 42

And, 20% of the same is 70.