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Answer:
69 child tickets were sold
Explanation:
represent the problem by systems of equations:
5.50c + 9.60a = 859.50
c + a = 119
c = 119 - a
5.50(119 - a) + 9.60a = 859.50
654.5 - 5.50a + 9.60a = 859.50
4.10a = 205
a = 50
c = 119 - 50
c = 69