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e : total de estudiantes
Solución:
100% - 43% = 57% ---> porcentaje de mujeres
Entonces:
e × 57% = 513
e × 57/100 = 513
57e/100 = 513
57e = 513 × 100
57e = 51 300
e = 51 300/57
e = 900 ---> total de estudiantes
RTA: El colegio tiene 900 estudiantes .