If A : B = 2 : 3 and B : C =4 : 5, then C : A is equal

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If A : B = 2 : 3 and B : C =4 : 5, then C : A is equal to ?

1. 15 : 8
2. 12 : 10
3. 8 : 5
4. 8 : 15

Correct Option: A

A/B = 2/3 and B/C = 4/5
∴ A/C = (A/B) x (B/C) = (2/3) x (4/5) = (8/15)
So, C : A = 15 : 8