Question 627533
Let x = current age of Sony
 so 4x = current age of Raju

  x - 5 = age of Sony 5 years ago
  4x - 5 = age of Raju 5 years ago

4x - 5 = 7(x - 5)
4x - 5 = 7x - 35
-3x = -30
x = 10

Therefore, Sony is 10 years old and Raju is 40 years old.