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ibu = y
anak = z
x:y = 5:4 = 15:12
y:z = 3:1 = 12:4
x:y:z = 15:12:4
x = 15/31 x 93 = 45 tahun
y = 12/31 x 93 = 36 tahun
z = 4/31 x 93 = 12 tahun