A, B and C can do a piece of work in 24, 30 and 40 days respectively. They start the work together but C leaves 4 days before the completion of the work. In how many days is the work done? Choose the correct choice from the following
A) 33 days  B) 77 days  C) 99 days  D) 11 days  E) 18 days
x/24 + x/30 + x/40 = 1   x = 11 days   Answer: 11 days
<result>D</result>
A, B and C can do a piece of work in 24, 30 and 40 days respectively. They start the work together but C leaves 4 days before the completion of the work. In how many days is the work done?