A and B can together finish a work in 30 days. They worked at it for 20 days and then B left. The remaining work was done by A alone in 20 more days. In how many days can A alone do it?
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A AND B FINISH IN =30 DAYS
A AND B IN 1 DAY=1/30
IN 20 DAYS=1/30x20=2/3
1/3 OF WORK IS DONE IN 20DAY
1=3x20=60
TOTAL IN=60
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