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 one:  A) 375  B) 400  C) 600  D) 800  E) 550
C's 1 day's work =1/3-1/6	+1/7	=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 x	1/24	x 3200 = Rs. 400.   Option 400
<result>B</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. 3200. With the help of C, they completed the work in 3 days. How much is to be paid to C?