$A$ can do a work in $20 \, \text{days}$ and $B$ in $40 \, \text{days}$. If they work on it together for $5 \, \text{days}$, then the fraction of the work that is left is:
- A$\frac{5}{8}$
- B$\frac{5}{15}$
- C$\frac{7}{15}$
- D$\frac{1}{10}$
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