15 men take 21 days of 8 hours each to do a piece of work. How many days of 6 hours each would 21 women take if 3 women do as much as 2 men ?

A 18

B 20

C 25

D 30

Correct Answer: Option D

Solution: 3 women = 2 man 21 women = 14 men

15 man works 8 hours for = 21 days

1 " " 1 " " = 21 \( \times \) 8 \( \times \) 15 days

14 " " 6 " " = (21 \( \times \) 8 \( \times \) 15) / (14 \( \times \) 6) = 30 days