Ne day efficiency of a is 20% more than b and that of c is 20% less than b. D can do a piece of work in twice of time as a, b & c complete same work in together. If first eight days d work alone after that he left the work and a, b & c complete the remaining work in 12 days. Find in what time work will be completed, if b and d work in rotation on each day, starting with d?
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