Answer:
They sold 325 student tickets and 404 adult tickets
Step by Step:
1)x+y=729
2)3x+5y=2992
3) 3(x+y=729)
4) 3x+5y=2995
3x+3y=2187
5) 2y=808
6) y=404
7) x+404=729
8) x=325
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