Correct Answer - Option 5 : 5
Given:
15 men can complete the work in 20 days
Concept used:
Equating the total work
Calculation:
Let the total work be 15 × 20 = 300
Let n be the working days of 15 men
300 = 15 × n + (14 – n) × 25
⇒ 300 = 15n + 350 – 25n
⇒ -10n = - 50
⇒ n = 5
∴ The number of day after which 10 men joined the work is 5 days.