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Umur lala = l
Umur kiki : umur lala = 4 : 3
k / l = 4/3
K = 4l/3
K-8 : l-8 = 3 : 2
K-8 / l-8 = 3/2
{(4l/3) - 8} / l-8 = 3/2
2{(4l/3) - 8} = 3(l-8)
8l/3 - 16 = 3l - 24...... Kali 3 setiap ruas
8l - 48 = 9l - 72
-48 + 72 = 9l - 8l
24 = l
l = 24
K = 4l/3 = 4(24)/3 = 32
Jadi umur kiki = 32 tahun
Sedangkan Umur lala = 24 tahun
Semoga membantu :D