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If A : B =2: 3, B : C = 5: 7 and C : D =...

If `A : B =2: 3, B : C = 5: 7 and C : D = 3:10`, then what is `A:D` equal to?

A

`1:7 `

B

`2:7 `

C

`1:5`

D

` 5:1`

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