You can 
put this solution on YOUR website! .
Jason + Ann = 
 = 48
Jason - Ann = 4.
---------------------------  Add these two equations to get
2*Jason = 48 + 4 = 52   ===>  Jason = 
 = 26.
Answer.  Jason's is 26 years old.  Ann is 26 - 4 = 22 years old.
Solved.