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Umur Ibu = x
Umur Ali = y
x = 3y
x -y = 24
x -y = 24
3y -y = 24
2y = 24
y = 24/2
y = 12 tahun
x = 3y
= 3(12)
= 36 tahun
Jadi, umur ibu = 36 tahun dan umur ali = 12 tahun.