9.--THE TWO AEROPLANES.

From Amusements in Mathematics by Henry Ernest Dudeney.

The man must have paid £500 and £750 for the two machines, making together £1,250; but as he sold them for only £1,200, he lost £50 by the transaction.

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9.--THE TWO AEROPLANES.: Amusements in Mathematics by Henry Ernest Dudeney | amphi