A can finish a work in 18 days and B can do the same work in 5 days. B worked for 10 days and left the Job. In how many days, A alone can finish the remaining work?

A can finish a work in 18 days and B can do the same work in 5 days. B worked for 10 days and left the Job. In how many days, A alone can finish the remaining work?
1). 6 days
2). $5\frac{1}{2}$ days
3). 5 days
4). 8 days

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