A ∶ B = 5 ∶ 4, B ∶ C = 6 ∶ 5, C ∶ D = 7 ∶ 10 అయితే, A ∶ D విలువ ఎంత?

1
21 ∶ 25
2
7 ∶ 3
3
21 ∶ 20
4
25 ∶ 24

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