CGPET 2015 Solved Paper

Two identical containers A and B with frictionless pistons contain the same ideal gas at the same temperature and the same volume V. The mass of the gas in A is mA and that in B is mB. The gas in each container is now allowed to expand isothermally to the same final volume 2V. The changes in the pressure in A and B are to be found ∆p and 1.5 ∆p respectively, then relation for masses will be