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3:5=7
1=3,5
3,5.3+1=11,5 tahun
maaf klw salah
F +8 = K
Lalu,
F : K = 3 : 5
5F = 3K
Substitusi:
5F = 3(F+8)
5F = 3F+24
2F = 24
F = 12
Berarti umur Fitri sekarang 12 tahun