If A : B = 3 : 4, B : C = 5 : 7 and C : D = 8 : 9 then A : D is equal to:
If A : B = 3 : 4, B : C = 5 : 7 and C : D = 8 : 9 then A : D is equal to
[A]10 : 21
[B]21 : 10
[C]3 : 7
[D]7 : 3
10 : 21
Hence option [A] is the right answer.
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