# A can do a piece of work in 10 days, B can do it in 15 days. They started work together. After 3 days B left from the work and C joined. After 2 days the remaining work was finished. Then in how many days the work could be finished by C alone?

+1 vote
So C can complete the work in 30 / (9/2) = 20/3 = $6\displaystyle\frac{2}{3}$