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i = 3a - 8
(i + 9)/(a + 9) = 2/1
i = 2a + 9
maka,
3a - 8 = 2a + 9
a = 17
substitusi :
i = 3a - 8 = 3(17) - 8 = 51 - 8 = 43
(i = usia ibu, a = usia anak)
i:usia ibu
a:usia anak
i-4)/(a-4)=3:1
(i+9)/(a+9)=2:1
i-4=3a-12.....(1)
i+9=2a+18....(2)
i=3a-8.....(1)
i=2a+9......(2)
3a-8=2a+9
a=17 tahun
i=3a-8=3.17-8=51-8=43 tahun