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Tenemos.
Total espectadores = 3000
Total adultos = x
Total niños = 3000 - x
Total dinero.
De adultos = 10x
De niños = 3(3000 - x)
10x + 3(3000 - x) = 21600
10x + 9000 - 3x = 21600
7x + 9000 = 21600
7x = 21600 - 9000
7x = 12600
x = 12600/7
x = 1800
Total adultos = x = 1800
Respuesta.
Asistierón 1800 adultos