7. A and b can do a piece of work in 28 days. With the help of c, they can finish it in 21 days. How long will c take to finish the work all alone
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A+B 's 1 day work = 1/28
A + B + C 's 1 day work = 1/21
1/28 + C= 1/21
C = 1/21 - 1/28
C = 1/84
So C ll finish the work alone in 84 days
Ans : 84 days
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Work done by A & B together in 1day = 1/28
Work done by A,B&C together in 1 day = 1/21
Work done by C in 1day =
1/21-1/28 = 1/84
Time taken by B to complete work = 84 days
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