Question 1068271
k, Ken
d, his dad


{{{system(k=d-25,k+14=(d+14)/2)}}}


Simple system of equations in two variables.  An obvious substitution will allow to solve for d, the dad's age currently.


{{{d-25+14=(d+14)/2}}}
{{{d-11=(d+14)/2}}}

{{{2d-22=d+14}}}

{{{d=14+22}}}

{{{highlight(d=36)}}}-----Dad's age now.
You can evaluate Ken's age now, k?