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2x = 4 tahun
x = 2 tahun
5;4;6 = 10 : 8 : 12
jumlah usia mereka = 30
T = Tasya
F = Fina
C = Caca
maka :
T : F : C = 5 : 4 : 6 = 5x : 4x : 6x
C = F + 4
C = F + 4
6x = 4x + 4
6x - 4x = 4
2x = 4
x = 4/2
x = 2
T + F + C = 5x + 4x + 6x
T + F + C = 5(2) + 4(2) + 6(2)
T + F + C = 10 tahun + 8 tahun + 12 tahun
T + F + C = 30 tahun