Correct Answer - Option 4 : 30
Given:
Group of workers estimate to finish a work in 10 days
5 workers could not join the work
Work is finished in 12 days
Calculation:
Let the number of workers present in the team be x
Total work = x × 10 = 10x
When 5 workers did not join
Number of workers = x - 5
Work is finished in 12 days
Now,
10x = (x - 5) × 12
⇒ 10x = 12x - 60
⇒ 2x = 60
⇒ x = 30
∴ Number of workers present in the team were 30