Question

Tickets to a concert cost $12 for adults and $8.50 for students. A total of 950 people paid $10175. How many adults were at the concert
12 a + 8.5 s = 10,175

a+s = 950 so s = (950-a)

12 a + 8.5(950-a) = 10,175

12 a + 8075 - 8.5 a = 10,175

3.5 a = 2100

a = 600

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