IF A:B=3:4 ,B:C=5:7 find A:B:C
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A:B=(3×5):(4×5) = 15:20
B:C=(5×4):(7×4)=20:28
A:B:C=15:20:28
B:C=(5×4):(7×4)=20:28
A:B:C=15:20:28
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