A can do a piece of work in 12 days and B in 15days.They work together for 5 days and then B left The days taken by A to finish the remaining work is

A can do a piece of work in 12 days and B in 15days.They work together for 5 days and then B left The days taken by A to finish the remaining work is
1). 3
2). 5
3). 10
4). 121

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