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2014-08-27T12:38:24+05:30

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Other expenses = Expenses food, gifts and accommodation =
                 = $ 80 less than 3 times Airfare
                 = 3 * Airfare - $80

Total Expenses = Airfare + Other expenses
          = Airfare + 3 * Airfare - $80 = $2, 660  as Given

           4 * Airfare - $80 = $2, 660

           4 * Airfare = $80 + $2, 660 = $2, 740

Hence,   Airfare = $2, 740 / 4  = $685


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