Rebecca R. answered 06/24/18
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Let A = Advance tickets
Let B = Same Day tickets
A + B = 50
30A + 25B = 1400
30(50-B) + 25B = 1400
1500 - 30B + 25B = 1400
100 = 5B
B = 20
A + 20 = 50
so A = 30