A can do a work in 15 days and B in 20 days. If they work on it together for 5 days, then what fraction of work is left?

A can do a work in 15 days and B in 20 days. If they work on it together for 5 days, then what fraction of work is left?
1). $\frac{2}{9}$
2). $\frac{3}{10}$
3). $\frac{5}{12}$
4). $\frac{1}{4}$

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