Question 262682
Let the age of the son = x
Then the age of his father = x+30
Given,father will be only thrice as old as the son after 5 years 
      x+30+5 = 3(x+5)
      x+35 = 3x+15
      35-15 = 3x-x
      20 = 2x
      2x = 20
      x = 20/2 = 10
Therefore the age of his father = x+30 = 10+30 = 45 years