Question

Sum of father and son age is 56 yr after 4 yr the age of the father will be 3 times if son

Answer 1

hey
I think that your question is not complete

Answer 2

Let father's age be 'x' and that of son's be 'y'.
$x + y = 56 \: \: (i) \\ (x + 4) = 3(y + 4) \: \: (ii) \\ x - 3y = 8 \: \: (iii) \\ solving \: (i) \: and \: (iii) \\ y = 12 \\ x = 44$
Therefore, father's present age is 44 and that of son's is 12.