If 60% of (x – y) = 45% (x + y) and y = k% of x, then 49% of k is equal to:
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 7.
60% of (x – y) = 45% (x + y)
⇒ 4(x - y) = 3(x + y)
⇒ 4x - 4y = 3x + 3y
⇒ x = 7y
⇒ y = x/7
⇒ y = k% of x
⇒ x/7 = k% of x
⇒ k = 14.28
⇒ 49% of k = = 6.99 ≈ 7