Q. 93.9( 23 Votes )
A and B together can finish a piece of work in 12 days. If ‘A’ alone can finish the same work in 20 days, in how many days B alone can finish it?
Let the number of days taken by B to finish the work be x.
Number of days taken by A to finish the work = 20.
Number of days taken by A and B together = 12.
According to the given condition,
⇒ (Transposing to RHS)
(LCM of 12 and 20 is 60)
⇒ x = 30
∴ B alone can finish the work in 30 days.
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