Heat And Thermodynamics

A monoatomic gas at pressure '\(\mathrm{P}\)' having volume '\(\mathrm{V}\)' expands isothermally to a volume \(2 \mathrm{~V}\) and then adiabatically to a volume \(16 \mathrm{~V}\). The final pressure of the gas is \(\left(\gamma=\frac{5}{3}\right)\)