A and B can finish a work in 30 days they worked for it for 20 days and then B left tha remaning work was done by A alone in 20 more days A alone can finish the work in
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A work = 1/30 part
B work=1/30part
so,1/30+1/30=2/30
2/30*20=2/3
Remaining work=1-2/3=1/3
work to be done/A one day work
1/3/1/30=1*30/3*1=10 days
B work=1/30part
so,1/30+1/30=2/30
2/30*20=2/3
Remaining work=1-2/3=1/3
work to be done/A one day work
1/3/1/30=1*30/3*1=10 days
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