100 g of liquid A (molar mass $140 g mol^{–1}$) was dissolved in 1000 g of liquid B (molar mass $180 g mol^{–1}$). The vapour pressure of pure liquid B was found to be 500 torr. Calculate the vapour pressure of pure liquid A and its vapour pressure in the solution if the total vapour pressure of the solution is 475 torr.
