If a : b = 5 : 7, b : c = 8 : 15, then find the value of 8c : 5a.
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. 21 : 5.
a : b = 5 : 7 = 40 : 56
b : c = 8 : 15 = 56 : 105
So, a : b : c = 40 : 56 : 105
Now, 8c : 5a
⇒ 8 × 105x : 5 × 40x
⇒ 21 : 5
The value of 8c : 5a is 21 : 5.