Multiple choice

Efficiency of a man is twice of a boy while efficiency of a woman is two third of the man. If 8 boys can do a work in 20 days then find out the number of day in which 4 men and 6 women can finish this work?

  1. 20

  2. 15

  3. 30

  4. 10

  5. 12

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Boy's efficiency = 1 unit. Man = 2 × boy = 2 units. Woman = (2/3) × man = 4/3 units. Total work = 8 × 20 = 160 boy-days = 160 units. Combined efficiency of 4 men + 6 women = 4(2) + 6(4/3) = 8 + 8 = 16 units/day. Days = 160/16 = 10 days.