The vapour pressure of a pure liquid 'A'...

The vapour pressure of a pure liquid 'A' is 70 torr at `27^(@)C`. It forms an ideal solution with another liquid B. The mole fraction of B is 0.2 and total pressure of the solution is 84 torr at `27^(@)C`. The vapour pressure of pure liquid B at `27^(@)C` is :

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