\textbf{170-} If the $(P-T)$ diagram of 5 moles of ideal gas A with volume 10 liters and $n$ moles of ideal gas B with volume 16 liters is as shown below, what is $n$?
\begin{minipage}{0.45\textwidth}
\textit{[Figure: P-T diagram showing two lines from origin, line (B) with steeper slope and line (A) with lesser slope, with $P_1$ and $\frac{4}{7}P_1$ marked on the pressure axis]}
\end{minipage}
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\begin{minipage}{0.45\textwidth}
\begin{itemize}
\item[(1)] $10$
\item[(2)] $14$
\item[(3)] $20$
\item[(4)] $28$
\end{itemize}
\end{minipage}