Question

A can do a piece of work in 10 days and B can do it in 18 days,and A,B and C together in 4 days .In what time would C do it alone

Answer 1

Let C's one day work be 1/x.
A's one day work = 1/10.
B's one day work = 1/18.

A+B+C's one day work together = 1/4
so,
1/10+1/18+1/x = 1/4.

solve for x
you'll get your answer...
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