9. A and B can do a job together in 25 days. After 15 days of working together, B leaves. If A completes the remaining part of the job in 20 days, how long would each take to complete
the job, working separately?
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Answer:one day work=1/25
for 15 days=15/25=3/5
remaining work=1-3/4=2/5
A finish the 2/5work in 20 days
A/5=10
A=50
1/A+1/B=1/25
1/B=1/25-1/50
B=50
Hope it is useful
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