States of Matter Questions

A mixture of $N_2$ and $Ar$ gases in a cylinder contains $7\text{g}$ of $N_2$ and $8\text{g}$ of $Ar$. If the total pressure of the mixture of the gases in the cylinder is $27\text{bar}$, the partial pressure of $N_2$ is:[Use atomic masses (in ${\text{g mol}}^{-1}$): $N=14,Ar=40$ ]