A and B can do a job in 15 days. They work together for 6 days and then B leaves. If A can do the job alone in 50 days, how long will he take to complete the unfinished job?
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a and b can do the job in 1 day 1/15 part
a and b can do the job in 6 days 1/15*6=6/15
the unfinished part of the job=1-6/15=9/15
a can do the job in 50 days =9/15*50
=30 days (ans)
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