AP EAPCET 20-Aug-2021 Shift 2 Paper

The vapour pressure of a solvent decreased by 20‌mm of Hg when a non-volatile solute was added to the solvent. The mole-fraction of the solute in the solution is 0.5. What should be the mole-fraction of the solvent for the decrease in the vapour pressure needs to be 10‌mm of Hg ?