a and b can together finish a work in 40 days. they worked it for 20 days and then b left. the remaining work was done by a alone in 30 days. a alone can finish the work in
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1 day's work of a and b=1/40
20 days work of a and b=20/40=1/2
remaining work=1-1/2=1/2
1/2 work was done by a in 30 days
so. a alone can finish the work in 60 days
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