If the given two numbers are respectively 5% and 25% of a third number, then what percentage is the first of the second ?
Select the correct option:
A) 20 %
B) 25 %
C) 18 %
D) 30 %
E) none of these

Rationale: "here , l = 5 and m = 25 therefore , first number = l / m x 100 % of second number = 5 / 25 x 100 % of second number = 20 % of second number answer : a"
Answer: A