If A:B = 5:6 and B: C = 4:7, find A:B:C
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A : B 5 : 6
B : C 4 : 7
A : B : C. =. (5*4) : (4*6) : (6*7)
A:B:C = 20 : 24 : 42
A : B : C = 10 : 12 : 21
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