Multiple choice

39 persons can do a work in 12 days working 5 hours a day. In how many days will 30 persons working 6 hours a day complete the work?

  1. 10 days

  2. 13 days

  3. 14 days

  4. 15 days

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

Work done = persons × days × hours/day. Total work = 39 × 12 × 5 = 2340 person-hours. For 30 persons working 6 hours/day: 2340 = 30 × d × 6, giving d = 2340/180 = 13 days. Option B is correct.