If 36 persons can finish 50% of work in 12 days In how many days 72 person can finish the complete work?

12

The correct answer is Option 4: 12

Step 1: Convert work into person-days

Work done = 36 persons × 12 days = 432 person-days

This completes 50% of the work.

So 100% work requires:

2 × 432 = 864 person-days

Step 2: Find days for 72 persons

Days = Total person-days / Number of persons

Days = 864 / 72

Days = 12