<PRE><B>Question 994099</B>
A theater has tickets at $6 for adults, $3.50 for students, and $2.50 for children under 12 years old. A total of 278 tickets were sold for one showing with a total revenue of $1300. If the number of adult tickets sold was 10 less than twice the number of students tickets, how many of each type of tickets were sold for the showing? 
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Equations:
a + s + t = 278 tickets
6a +3.5s + 2.5t = 1300
a = 2s-10
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Modify::
a + s + t = 278
60a + 35s + 25t = 13000
a   -  2s +  0  = -10
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Use any method to get:
a = 150 
s = 80
t = 48
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