1.

1). 10 days2). 13 days3). 17 days4). 30 days

Answer»

Let Jake can FINISH the piece of WORK alone in x days.

ASHLEY can alone finish the work in x/2 days.

In 1 DAY Jake can do work = 1/x

In 1 day Ashley can do work = 1/(x/2) = 2/x

1/x + 2/x = 1/20

⇒ 3/x = 1/20

⇒ x = 60

∴ Ashley alone can finish the work in 60/2 i.e. 30 days



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