A museum has three different admission costs:
$10 for Adults
$2.50 for students in 9th-12th grade
$0.50 for students in 1st-8th grade
A school wants to send 100 people (including teachers, 8th graders, and 9th graders) to the
museum. If they want to spend exactly $100 on buying 100 tickets, how many adults, 8th graders, and 9th graders should go on the trip?
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