If A : B = 1 : 3, and B : C = 5 : 7 then A : B: C is ____.
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 5 : 15 : 21
A : B = 1:3 , after multiplying by 5 = 5:15
B : C = 5:7 , after multiplying by 3 = 15:21
So, A : B : C = 5 : 15 : 21