If 0.4 of a number is equal to 0.06 of another number, the ratio of the numbers i
Choose the correct choice from the following answers:
A) 2 : 3  B) 3 : 4  C) 3 : 20  D) 20 : 3  E) none

Rationale: "sol . 0.4 a = 0.06 b ⇔ a / b = 0.06 / 0.40 = 6 / 40 = 3 / 20 . ∴ a : b = 3 : 20 . answer c"
Answer: C