Question

Two numbers are respectively 20 percent and 50 percent of a third number. What percent is the second of the first ?

Answer 1

Let the third number be 100
$\therefore$ The first number = 20% of 100
= $\frac{20}{100}\times 100$ = 20
and the second number = 50% of 100
= $\frac{50}{100}\times 100$ = 50
$\therefore$ The second no. as the percent of the first
= $\frac{50}{20}\times$ 100% = 250%