Question 1199241
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Here is an informal solution method, using logical reasoning and mental arithmetic instead of formal algebra.<br>
If all 400 tickets had been student discounted tickets, the total revenue would have been 400($25) = $10,000.
The actual total revenue was $11,200, which is $1200 more.
The difference in cost between the two kinds of tickets is $5; the number of regular price tickets needed to make up the additional $1200 is 1200/5 = 240.<br>
ANSWER: 240 people purchased regular tickets.<br>
CHECK: 240(30)+160(25) = 7200+4000 = 11200<br>