Two solutions of `A` and`B` are available. The first is known to contain `1` mole of `A` and `3` moles of `B` and its total vapour pressure is `1.0` atm. The second is known to contain `2` moles of `A` and `2` moles of `B`, its vapour pressure is greater than `1` atm, but if is found that this total vapour pressure may be reduced to `1` atm by the addition of `6` moles of `C`. The vapour pressure of pure `C` is `0.80` atm. Assuming ideal solutions and that all these data refered to `25^(@)C`, calculate the vapour pressure of pure `A` and `B`.