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?

English
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?

2

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?

Answer:

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