Question 230067
Let x = the son's age
7x-5 = Mary's age


Since Mary's age is 30,

7x-5=30


Add +5 to each side:
7x-5+5=30+5
7x=35
x=5  Son's age
7x-5= Mary's age
7*5-5= 35-5=30 It checks!!


Dr. Robert J. Rapalje, Retired
Seminole State College of Florida
Altamonte Springs Campus