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A certain number men agreed to do a work in 20 days. 5 men did not come for work. Others completed the work in 40 days. Find the number of men who had agreed to do the work originally?
- A8
- B10
- C12
- D15
Answer not set
Discussion 1
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CCommunity
Let the number of men who agreed to do the work in 20 days be x
⇒ work done by x men = 20x
Also given (x - 5) men will complete the work in 40 days
⇒ work done by (x - 5) men = 40(x - 5)
Since the work done by both are same
⇒ 20x = 40(x - 5)
⇒ 20x - 40x = - 200
⇒ x = 10
∴ No of men who had agreed to do the work originally = 10
⇒ work done by x men = 20x
Also given (x - 5) men will complete the work in 40 days
⇒ work done by (x - 5) men = 40(x - 5)
Since the work done by both are same
⇒ 20x = 40(x - 5)
⇒ 20x - 40x = - 200
⇒ x = 10
∴ No of men who had agreed to do the work originally = 10