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Composition of the vapour

Choose the right answer from following. An ideal solution was obtained by mixing methanol and ethanol. If the partial vapour pressure of methanol and ethanol are 2.619KPa and 4.556KPa respectively, the composition of the vapour (in terms of mole fraction) will be: (a) 0.635 methanol, 0.365 ethanol (b) 0.365 methanol, 0.635 ethanol (c) 0.574 methanol, 0.326 ethanol (d) 0.173 methanol, 0.827 ethanol

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