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B : C = 15 : 7
Samakan B jadi 15
A : B = 18 : 15 [x3]
B : C = 15 : 7
Berarti A : B : C = 18 : 15 : 7
B : C = 15 : 7
A : B = 6 : 5 [x3] ⇒ A:B=18:15
B : C = 15 : 7
Berarti A : B : C = 18 : 15 : 7