A carpenter worked alone for 1 day on a job that would take him 6

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A carpenter worked alone for 1 day on a job that would take him 6 more days to finish. He and another carpenter completed the job in 4 more days. How many days would it have taken the second carpenter to do the complete job working alone?

A) 4 2/3
B) 7
C) 9
D) 14
E) 24

Answer: D
Source: GMAT paper tests
Source: — Problem Solving |