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 answers:	A) 11 days	B) 14 days	C) 13 days	D) 10 days	E) 20 days
x/24 + x/30 + x/40 = 1   x = 11 days   11 daysNSWER 11 days
<result>A</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?