If A : B = 3 : 4, B : C = 5 : 6, and C : D = 12 : 17, what is A : D?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 15 : 34
A/B = 3/4 , B/C = 5/6 , C/D = 12/17
⇒ A/B × B/C × C/D = 3/4 × 5/6 × 12/17
⇒ A/D = 180/408 = 15/34
Hence, A : D is 15 : 34.