if A:B= 4:7 and B:C= 5:3 then find A:B:C
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A:B=5:6
So,
BA=65
A=65B ......(1)
B:C=4:7
So,
CB=74
C=47B ......(2)
From (1) and (2),
A:B:C=65B:B:47B
=65:1:47
=10:12:21
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