If 0.4 of a number is equal to 0.07 of another number, the ratio of the numbers i Choose the correct option
A) 2 : 3
B) 7 : 40
C) 3 : 20
D) 20 : 3
E) none

Rationale: "sol . 0.4 a = 0.08 b â ‡ ” a / b = 0.07 / 0.40 = 7 / 40 . â ˆ ´ a : b = 7 : 40 . answer b"
Answer: B