A work that could be completed in 10 days was completed in 8 days as 5 more men joined at the start of work. What was the total number of men before the 5 men joined?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 20.
Explanation :
Let the number of men before 5 people join be x.
Now given that, work done by x men in 10 days = work done by (x + 5) men in 8 days
So, x × 10 = (x + 5) × 8
⇒ 10x = 8x + 40
⇒ 10x - 8x = 40
⇒ 2x = 40
⇒ x = 20
Hence the number of men initially was 20.