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50% = 0.5
X = Edad Micaela
X + 5 = Edad de Cecilia
0.5X + 5 = Edad de Nadia
X + (X + 5) + (0.5X + 5) = 35
X + X + 5 + 0.5X + 5 = 35
2.5X + 10 = 35
2.5X = 35 - 10
2.5X = 25
X = 25/2.5
X = 10
Edad de Micaela = 10 años
Edad de Cecilia = 10 + 5 = 15 años
Edad de Nadia = 0.5(10) + 5 = 5 + 5 = 10 años
10 + 15 + 10 = 35 años