At ${80}^{\circ }C$, the vapour pressure of pure liquid 'A' is 520 mm Hg and that of pure liquid 'B' is 1000 mm Hg. If a mixture solution of 'A' and 'B' boils at ${80}^{\circ }C$ and 1 atm pressure, the amount of 'A' in the mixture is (1 atm = 760 mm Hg)

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