If A : B = 5 : 6 and B : C = 6 : 7, then A + B : B + C : A + C is:
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → 11 : 13 : 12
The two ratios share B, and B is 6 in both, so they join directly into one ratio A : B : C.
A : B : C \(=5:6:7\)
A + B \(=5+6=11\); B + C \(=6+7=13\); A + C \(=5+7=12\)
So A + B : B + C : A + C \(=11:13:12\)