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. 3200. 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 options:
A) Rs. 375  B) Rs. 400  C) Rs. 600  D) Rs. 800  E) Rs. 900
Explanation:   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.(3X1/24X3200)=Rs. 400   ANSWER IS Rs. 400
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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. 3200. With the help of C, they completed the work in 3 days. How much is to be paid to C?