If 10 people can do a job in 20 days, then 20 people with

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If 10 people can do a job in 20 days, then 20 people with twice the efficiency can do the same job in

In second case, the efficiency of a man is twice to that in the first case.
∴ M₁D₁ = 2 M₂D₂
⇒ 10 × 20 = 2 × 20 × D₂

⇒ D₂ =	10 × 20	= 5 days
	2 × 20