Question

Worker A can build a wall alone in 30 days. When A and B work together, they can complete the wall in 16 days. If B starts building the wall alone and works for 20 days before leaving, how many additional days will A need to finish the remaining work alone?

A 10 days
B 11 days
C 12.5 days
D 14.5 days
E None of these
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