Correct Answer - Option 2 : 13
Given :
M1 = 39 person , M2 = 30 persons
D1 = 12 days , D2 = ?
H1 = 5 hours , H 2 = 6 hours
Formula used :
M1 × D1 × H1 / work1 = M2 × D2 × H 2 / work2
Calculation :
Substituting the values in the formula
39 x 5 x 12 = 30 × 6 × days
⇒ 2340 = 180 × days
⇒ days = 2340 / 180 = 13
∴ 30 persons will complete the work in 13 days.