36 men together can build a wall 140 m long in 21 days.

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36 men together can build a wall 140 m long in 21 days. The number of men working at the same rate required to build the same wall in 14 days is

Here, the length of wall is
same in both cases.
∴ M₁D₁ = M₂D₂
⇒ 36 × 21 = M₂ × 14

⇒ M₂ =	36 × 21	= 54 days
	14