On a trip, the fare was 50¢ for each adult and 25¢ for each child. If 30 passengers paid $12.25, how many adults and children went?
Which of the following equations could not be used to solve the problem?
50 (30 - x) + 25 x = 1225
25 x + 50 x = 30 (1225)
50 x + 25 (30 - x) = 1225
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