If one man or two women or four boys or five girls can finish a work in 39 days, thenhow many days will one man, one woman, one boy and one girl together take to finishthe same work?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is Option 4 i.e. 20.
Calculations:
Let the men, women, boys and girls be M, W, B and G
According to the question;
⇒ 1M = 2W = 4B = 5G
Ratio of efficiency of M : W : B : G = 20 : 10 : 5 : 4
Total work = 1 × 20 × 39
Required number of days = (1 × 20 × 39)/(20 + 10 + 5 + 4) = (20 × 39)/39 = 20