A can do a piece of work in 40 days; B can do the same in 30 days. A started alone but left the work after 10 days, then B worked at it for 10 days. C finished the remaining work in 10 days. C alone can do the whole work in?	Choose the correct choice
A) 24 days  B) 30 days  C) 44 days  D) 17 1/2 days  E) 60 days
Explanation:   10/40 + 10/30 + 10/x = 1   x = 24 days   24 daysnswer: 24 days
<result>A</result>
A can do a piece of work in 40 days; B can do the same in 30 days. A started alone but left the work after 10 days, then B worked at it for 10 days. C finished the remaining work in 10 days. C alone can do the whole work in?