q = a + 15
3a + 2q = 3 1/8
Substitute a+15 for q in the second equation and solve for a.
It will take an apprentice 15 days longer than a qualified printer to complete a job. However if 3 apprentices and two qualified printers work together the job can be completed in 3 1/8 days. how long would it take one apprentice to do the job
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