If 72 men can build a wall of 280 m length in 21 days,

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If 72 men can build a wall of 280 m length in 21 days, how many men could take 18 days to build a similar type of wall of length 100 m?

Using Rule 1,
We know that

	W₁	=	W₂
	M₁D₁		M₂D₂

⇒	280	=	100
	72 × 21		x × 18

Where x = number of men
⇒ x × 18 × 280 = 100 × 72 × 21

⇒ x =	100 × 72 × 21	= 30
	18 × 280