If a : b = 5 : 3, then find (6a + 2b) : (6a - 2b)
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 3 : 2.
a : b = 5 : 3 = 5k : 3k
⇒ (6a + 2b) : (6a - 2b)
⇒ (6 × 5k + 2 × 3k) : (6 × 5k - 2 × 3k)
⇒ (30k + 6k) : (30k - 6k)
⇒ 36k : 24k = 3 : 2