A:B=3:4, B:C=5:7, C:D=8:9 then A:D
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AD = 3:9 is the answer
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A:D=A/D=A/B×B/C×C/D
=3/4×5/7×8/9
= >10/21=10:21
=3/4×5/7×8/9
= >10/21=10:21
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