Symbiosis National Aptitude Test SNAP 2015 Paper

Let present age of X = x years
Present age of Y = (x – 3) years
3 years ago, age of X = (x – 3) years
Age of Y = (x – 6) years
According to the question,
x – 3 = 2(x – 6)
⇒ x – 3 = 2x – 12
⇒ 12 – 3 = 2x – x
x = 9 years