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Hilda = H
Cecilia = C
F = H/3 (1)
C =2F (2)
F + C + H = 72 (3)
De (1) despejas H
F = H /3 = > 3F = H (4)
De (2) despejas F
C=2F = C/2 = F (5)
Reemplazas (4) y (5) en (3)
F + C + H = 72
C/2 + C + 3F = 72
C/2 + C + 3(C/2) = 72
C/2 + C + 3C/2 = 72
(C + 2C + 3C)/2 = 72
6C = 72×2
6C = 144
C = 144/6
C = 24
Respuesta Cecilia tiene 24 años