$20 \, mL$ of $0.5 \, M \, HCl$ is mixed with $30 \, mL$ of $0.3 \, M \, HCl$. The molarity of the resulting solution is $......... \, M$.
- A$0.8$
- B$0.53$
- C$0.38$
- D$0.83$
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