If a : b = 7 : 4, then what is the value of (6a + b) : (6a - b)?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is Option 4 i.e. 23 : 19.
Calculations:
a : b = 7 : 4
⇒ (6a + b)/(6a - b) = (6 × 7 + 4)/(6 × 7 - 4)
⇒ (42 + 4)/(42 - 4)
⇒ 46/38 = 23/19