CF / (CF+FB) = EF / AB
CF / (CF+4) = 5 / 7
7CF = 5 (CF+4)
7CF = 5CF + 20
7CF - 5CF = 20
2CF = 20
CF = 20/2 = 10 cm
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CF / (CF+FB) = EF / AB
CF / (CF+4) = 5 / 7
7CF = 5 (CF+4)
7CF = 5CF + 20
7CF - 5CF = 20
2CF = 20
CF = 20/2 = 10 cm