The total number of audience members is 1,800
Percent of teenagers in concert = 20%
Number of teenagers at the concert = 360
The total number of audience members
The total number of audience members = Number of teenagers at the concert[100 / 20]
The total number of audience members = 360[100 / 20]
The total number of audience members = 360[5]
The total number of audience members = 1,800
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