If (a + b) : c = 6 : 7 , (b + c) : a = 11 : 2, then (a + c) : b = ?

In these type of questions always note that the total amount/ratio must be same in all conditions.

⇒ (a + b) : c = 6 : 7  = 13 (total)

⇒ (b + c) : a = 11 : 2 = 13 (total)

total equal is already equal,

Therefore,

a = 2, c = 7 & b = 13 -(2 + 7) = 4

Here,

⇒ (a + c) : b = 9 : 4