Rs.700 is divided among A, B and C so that A receives half as much as B and B half as much as C. Then C`s share is:
Rs.200
Rs.300
Rs.400
Rs.600
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X and Y can do a piece of work in 20 days and 12 days respectively. X started the work alone and then after 4 days .Y joined him till the completion of the work. How long did the work last?