CIVIL SERVICE EXAM WORD PROBLEM #52

Andrei can build a wall in 6 days. Reagan had worked on the wall for three days alone before Andrei joined him. Together, they have completed the wall in three more days. How long will it take Reagan to build the wall alone?
A. 10 days
B. 12 days
C. 14 days
D. 16 days
E. 18 days
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