A can do three times the work done by B in one day.the together finish 2/5 of work in 9 days. The number of days by which B can do the work alone are.
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x+y=2/5/9
x+y=2/45
3y+y=2/45
4y=2/45
y=1/90
b does work in 90days alone
x+y=2/45
3y+y=2/45
4y=2/45
y=1/90
b does work in 90days alone
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