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Call the ages of the stated persons by the first letter of their names. From the second sentence of the problem statement, A = 1 + C and B = 1 + C. Substituting these values into the sum given in the first sentence of the problem statement yields 1 + C + 1 + C + C = 59, or C = (59 - 2)/3 = 19, A is 20, and B is 20. Seven years ago, C was 12 but A and B were both 13 and therefore were teenagers, but C was not.

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14y ago

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