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Question:A, B and C together can do a piece of work in 20 days. After working with B and C for days, A leaves and then B and C complete the remaining work in 20 days more. In how many days, A alone could do the work ?

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+ AnswerB

+ Explanation(b) : (A + B + C),s 8 days ' work` = (1/20 xx 8)`

        `= 2/5`

Remaining work` = (1 - 2/5)`

                     `= 3/5`

`3/5` work is done by (b + c) in 20 days

Whole work will be done by (B + C) in` (20 xx 5/3)`

      `= (100)/3` days

:. (B + C)'s 1 days work ` = 3/100`

:. A's 1 days work` = 1/20 - 3/100`

      `= 2/100`

    `= 1/50`

Hence, A can finish the whole work in 50 days.

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Question:A, B and C together can do a piece of work in 20 days. After working with B and C for days, A leaves and then B and C complete the remaining work in 20 days more. In how many days, A alone could do the work ?

A 40

B 50

C 60

D 80

B