If a : b = 3 : 5 and a : c = 5 : 7, what is the value of b : c?

If a : b = 3 : 5 and a : c = 5 : 7, what is the value of b : c? Correct Answer 25 : 21

Here,  a : b = 3 : 5 = (3×5) : (5×5) = 15 : 25 Again,  b : c = 5 : 7 = (5×3) : ( 7×3) = 15 : 21 So,  a : b : c = 15 : 25 : 21 Therefore,  b : c = 25 : 21
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