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Total alumnos = 47
Total de niñas = x
Total de niños = x +9
x + x + 9 = 47
2x + 9 = 47
2x = 47 - 9
x = 38/2
x = 19
Respuesta.
Hay 19 niñas
Hay x + 7 = 19 +9 = 28 Niños