$(a)\;\large\frac{7}{3}\qquad(b)\;\large\frac{5}{4}\qquad(c)\;\large\frac{19}{13}\qquad(d)\;\large\frac{15}{19}$

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Answer : $\;\large\frac{19}{13}$

Explanation :

$C_{peq} = \large\frac{n_{1}C_{p_{1} }+ n_{2} C_{p_{2}}}{n_{1}+n_{2}}$

$C_{veq} = \large\frac{n_{1} C_{v_{1}}+n_{2} C_{v_{2}}}{n_{1}+n_{2}}$

$r_{eq} = \large\frac{C_{peq}}{C_{veq}} = \large\frac{\large\frac{2 \times \large\frac{7}{2}+1\times \large\frac{5}{2}}{3}}{2 \times \large\frac{5}{2} + 1 \times \large\frac{3}{2}}$

$=\large\frac{19}{13}$

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