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OpenStudy (anonymous):
when 4131 people attended a concert, the concert hall was 90% full. How many seats does the concert hall have ?
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OpenStudy (anonymous):
4590
OpenStudy (rulnick):
capacity * 0.9 = 4131 so capacity = 4131 / 0.9 = ...
OpenStudy (anonymous):
4131= X*0.9 hence x= 4131/.9=4590
OpenStudy (luigi0210):
Make a proportion: \[\frac{ 4131 }{ x }=\frac{ 9 }{ 10 }\]
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