if A:B=2:3 ,B:C=4:5 and C:D=6:7 find A:D
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A:B=2:3 ,B:C=4:5 and C:D=6:7
A : B * B :C = 2 : 3 * 4 : 5
A : C = 8 : 15
A : C * C : D = 8 : 15 * 6 : 7
A : D = 16 : 35 ( Answer )
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