A can do a piece of work in 15 days and B in 20 days. With the help of C, the work gets
finished in 5 days. How long will C take to finish the work alone?
A can do a piece of work in 25 days and B can finish it in 20 days. Both started the
work together. After 5 days, A left. In how many days will B finish the remaining
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Answer:
A can do 1/15th of the work in one day
B can do 1/20 work in one day
work done by A and B together in one day: 1/15+1/20 = 7/60 part of the work
work done by A+B+C in one day = 1/5 of the work
C alone does in one day 7/60 - 1/5 = 5/60th part of the work
5/60 = 12 days
Therefore C takes 12 days to finish the work
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