A and B can do a certain work in 15 days and 20 days respectively. but with the help of c they can complete the same work in 5 days how long will c alone take to complete the work?
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a's one day work =1/15
b's one day work =1/20
a+b+c's one day work =1/5
c's one day work = 1/5-1/20-1/15 =1/12
c did work in 12 days
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