Madhya Pradesh Police Exam Model Paper 2

Given:

P can do a piece of work = 20 days

Q can do a piece of work = 40 days

P leaves that work 10 days before completion

Concept used:

Total work = LCM

Formula used:

Efficiency = Work/Time

Calculations:

Total work = LCM = 40

Let the work finishes in x days

So, Time in which P works = (x – 10)

Work done by P in (x – 10) days = 2 × (x – 10)

Work done by Q in x days = 1 × x = x

Now,

⇒ 2(x – 10) + x = 40

⇒ 2x – 20 + x = 40

⇒ 3x = 60

⇒ x = 20 days