A and B together can complete a work in 8 days. B alone can complete that worked for four days, After that how long will A alone take to complete the work ?

A and B together can complete a work in 8 days. B alone can complete that worked for four days, After that how long will A alone take to complete the work ?
1). 15 days
2). 18 days
3). 16 days
4). 20 days

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