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a-10=2b-20
-10+20=2b-a
2b-a=10
a-5=1,5(b-5)
a-5=1,5b-7,5
-5+7,5=1,5b-a
1,5b-a=2,5
2b-a=10
1,5b-a=2,5
(dikurangi)
0,5b=7,5
b= 15tahun
a-10 =2(b-10)
a-10=2(15-10)
a-10=10
a=20 tahun