Question

A wall of 100 metres can be built by 7 men or 10 women in 10 days. How many days will 14 men and 20 women take to build a wall of 600 metres?

• A. 15
• B. 20
• C. 25
• D. 30

Answer 1

Answer: (A)

15

According to question 10 women = 7 men $\therefore$ 20 women = 14 men
14 men + 20 women = 14 men + 14 men = 28 men
A wall of 100 m is built by 7 men in 10 days A wall of 100 m is built by 1 man in (10 x 7) days
A wall of 1 m is built by 1 man in $\frac{10\times 7}{100}$ days (less length, less days)
A wall of 600 m is built by 1 man in $\frac{10\times 7\times 600}{100}$ days (more length, more days)
A wall of 600 m is built by 28 men in $\frac{10\times 7\times 600}{100\times 28}$ days = 15 days