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misal umur beni=b
misal umur tomi=c
a=1/2b sehingga b=2a
a=1/3c sehingga c=3a
a+b+c=84
a+2a+3a=84
6a=84
a=14
b=2a
b=2 x 14
b= 28
c=3a
c=3 x 14
c= 42
1/3 u.toni = 84 --> 84/3 = 28 umur toni = 28 tahun