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Niños: n
Adultos: a
Nos dicen que: n = 2a
Pero sabemos que: n + a = 540
2a + a = 540
3a = 540
a = 180
→ n = 360
∴ Recaudación= 180x9 + 360x5
1620 + 1800
3420
Respuesta: 3420