1.

1). 54 days2). 57 days3). 60 days4). 63 days

Answer»

Let the number of days in which B finishes the work be ‘d’ days

Given, A is twice as EFFICIENT as B

∴ Number of days in whicha A finishes the work = d/2

Given, together they can do a work in 21 days

In 1 DAY, they together finish 1/21th of the work

∴ 1/d + 2/d = 1/21

⇒ 3/d = 1/21

⇒ d = 63 days



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