Need help setting up.
a theater audience of 90 people consists of adults,seniors,and students. The ticket prices are $9 for adults, $5 for seniors, and $2 for students. The total number of tickets sold to seniors and students is 20 more than the number of tickets sold to adults. The total money taken in from ticket sales is $515. How many adults, seniors and students are in attendance?

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set it up algebraically

@jim_thompson5910

90=x+y+z
y+z=x+20
515=9x+5y+2z

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