A and B can together finish 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 daysA alone can finish the work in

A and B can together finish 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 daysA alone can finish the work in
1). 60 days
2). 54 days
3). 48 days
4). 50 days

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