If 0.4 of a number is equal to 0.06 of another number, the ratio of the numbers is :
Choose the correct choice from the following answers
A) 2 : 3 B) 3 : 4 C) 3 : 20 D) 20 : 3 E) 22 : 1

Rationale: "expl : 0.4 a = 0.06 b - > a / b = 0.06 / 0.40 = 6 / 40 = 3 / 20 : . a : b = 3 : 20 answer : c"
Answer: C