If 36 persons can finish 50% of work in 12 days, in how many days can 72 persons finish the complete work?
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → 12
A job needs a fixed number of person-days (persons × days), so more persons finish it in proportionally fewer days.
50% of the work takes \(36\times12=432\) person-days
The complete work takes \(2\times432=864\) person-days
72 persons need \(\displaystyle\frac{864}{72}=12\) days