If the given two numbers are respectively 6% and 18% of a third number, then what percentage is the first of the second ?	Choose the correct choice from the following answers.
A) 20 %
B) 25 %
C) 18 %
D) 33 1 / 3 %
E) none of these

Rationale: "here , l = 6 and m = 18 therefore , first number = l / m x 100 % of second number = 6 / 18 x 100 % of second number = 33 1 / 3 % of second number answer : d"
Answer: D