Question

A alone can complete a piece of work in 12 days and B alone can complete the same work in 18 days.  If they work together for 4 days, then A leaves and B continues alone to finish the remaining work, in how many  total days  (from the beginning) will the work be completed?

A 12 days
B 18 days
C 20 days
D 24 days
E None of these
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