Liquid Solution

Elements $X$ and $Y$ form two non-volatile compounds ( $X Y$ and $X Y_3$ ). When 10 g of $X Y$ is dissolved in 50 g of ethanol, the depression in freezing point ( $\Delta T_f$ ) was 5.333 K . When 10 g of $X Y_3$ is dissolved in 50 g of ethanol, the (was $\left.\Delta T_f\right) 2.2857 \mathrm{~K}$. What are the atomic weights of $X$ and $Y$ respectively?

\(\left(K_f=2 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}^{-1}\right)\)