Students at a school were on average 180 cm tall. The average female height was 170 cm, and the average male height was 184 cms. What was the ratio F of men to women?
Choose one
A) 5 : 2  B) 5 : 1  C) 4 : 3  D) 4 : 1  E) 3 : 1

Rationale: ( a ) f = 184 x 5 + 170 x 2 = 1260 . a
Answer: A