If 20 men can build a wall 56 meters long in 6 days , what

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If 20 men can build a wall 56 meters long in 6 days , what length of a similar wall can be built by 35 men in 3 days ?

Here , M₁ = 20 Men , D₁ = 6 days , W₁ = 56 meters long wall
M₂ = 35 Men , D₂ = 3 days , W₂ = ?
We know that ,

⇒	M₁D₁	=	M₂D₂
	W₁		W₂

⇒	20 x 6	=	35 x 3
	56		W₂

⇒ W₂ = 7 x 7 = 49 meters long wall .