If (a + b) : c = 7 : 5, (b + c) : a = 9 : 3 , then (a + c) : b = ?

2 : 1 2 : 3  1 : 2 3 : 4

2 : 1

In these type of questions always note that the total amount/ratio must be same in all conditions. ⇒ (a + b) : c = 7 : 5  = 12 (total) ⇒ (b + c) : a = 9 : 3 = 12 (total) total equal is already equal, Therefore, a = 3 , c = 5 & b = 12 -(3 + 5) = 4 Here, ⇒ (a + c) : b = 8 : 4  = 2 : 1