Answer:
grad_age=matric_age+4
Explanation:
As mention in the question their are two variable matric_age and grad_age respectively .The grad_age variable store the value of 4 more than that of matric_age i.e (matric_age+4) means that it store the value 4 plus matric_age Suppose a matric_age is initialized with 4 then value of grad_age=4+4=8.