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El total de alumnos = x
Total niñas = 3/5 de x = 3/5 * x = 3x/5
Total niños = x - 3x/5 = 5x/5 - 3x/5 = (5x - 3x)/5 = 2x/5
2x/5 = 750
2x = 750*5
x = 3750/2
x = 1875
El total de alumnos = 1875
Total niñas = Total alumnos - Total niños
Total niñas = 1875 - 750
Total niñas = 1125
Respuesta.
El total de niñas es de 1125