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

Answer: (a) 15: 8 

Solution:-
A: B = 2: 3 and B: C = 4: 5 
Then A: B : C = 8: 12: 15
and
A:C = 8: 15

Then, C:A = 15:8

Hence, the correct answer is option  (a) 15: 8