A alone can do a piece of work in 6 days and B alone in 8 days. A and B undertook to do it for Rs.7000. With the help of C, they completed the work in 3 days. How much is to be paid to C? Choose the correct choice from the following answers
A) s. 375  B) s. 400  C) s. 600  D) s. 800  E) s. 875
C's 1 day's work = 1/3 - (1/6 + 1/8) = 1/3 - 7/24 = 1/24   A's wages : B's wages : C's wages = 1/6 : 1/8 : 1/24 = 4: 3 : 1   C's share (for 3 days) = Rs.	(3 * 1/24 * 7000) =Rs.875   Answer = s. 875
<result>E</result>
A alone can do a piece of work in 6 days and B alone in 8 days. A and B undertook to do it for Rs.7000. With the help of C, they completed the work in 3 days. How much is to be paid to C?