if a:b=5:6 and b:c=4:7 find a:b:c
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A : B = (5 : 6) * 4
A : B = 20 : 24 ----------------- (1)
B : C = (4 : 7) * 6
B : C = 24 : 42 ------------------- (2)
A : B : C = 20 : 24 : 42
A : B : C = 10 : 12 : 21.
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