5 moles of liquid X and 10 moles of liquid Y make a solution having a vapour pressure of 70 torr. The vapour pressures of pure X and Y are 63 torr…

$\displaystyle 5$ moles of liquid X and $\displaystyle 10$ moles of liquid Y make a solution having a vapour pressure of $\displaystyle 70$ torr. The vapour pressures of pure X and Y are $\displaystyle 63$ torr and $\displaystyle 78$ torr respectively. Which of the following is true regarding the described solution?