A can do a piece of work in 10 days, and B can do the same work in 20 days. With the help of C, they finished the work in 4 days. C can do the work in how many days, working alone?

A can do a piece of work in 10 days, and B can do the same work in 20

1.	A can do a piece of work in 10 days, and B can do the same work in 20 days. With the help of C, they finished the work in 4 days. C can do the work in how many days, working alone?
A.	5 days
B.	10 days
C.	15 days
D.	20 days
E.	25 days
Answer» C. 15 days

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