if a:b = 6:7 and b:c = 8:9 , find a:b:c
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A:B=6:7 ==> 7A = 6B => A = (6/7)B
B:C=8:9 ==> 8c = 9B => C =(9/8)B
Hence A:B:C = (6/7) : 1: (9/8) = 48 : 56 : 63
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