A can do a work in 21 days. B is 40% more efficient than

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A can do a work in 21 days. B is 40% more efficient than A. The number of days required for B to finish the same work alone is

Time taken by B

=	21 × 100	= 15 days
	140

Aliter : Using Rule 17,
Here, x = 21, R = 40%
Time taken By B

= x ×	100	days
	100 + R

= 21 ×	100	= 15 days
	140