Question

A and B together finish their works in 12 days,b can finish the work in 30 days how many days did a taken to complete his work

Answer 1

A and B together finish in 12 days

So work done by both of them in one day = 1/12

B alone can complete a work in 30 days ,

 So work done by B alone in one day = 1/30

Hence, work done by A = 1/12 - 1/30

                                        =(5-2)/60 = 3/ 60

When simplified , we get the answer as 1/20

So total time taken by A to do work = 20 days

Hence it is proved that a can do a work in 20 days

Answer 2

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