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Fina : Caca = 4 : 6
F : C = 2 : 3
2C = 3F
C = 3/2F
--
C = 4 + F
3/2F = 4 + F
3/2F - F = 4
3/2F - 2/2F = 4
1/2F = 4
F = 8 tahun
--
C = 3/2F
C = 3/2 x 8
C = 12 tahun
--
T : F = 5 : 4
5F = 4T
5 x 8 = 4T
4T = 40
T = 10 tahun