Question 927686
let present ages of Thess  and Bryan be x, y respectively
 sum of their ages is 60
 so x+y= 60 
 thess is four years younger than bryan
so  x+4 =y
put y=x+4 in x+y= 60
            x+(x+4)=60
              x+x+4=60
           2x+4 =60
 move 4 to the right 
 2x=60-4
 2x=56
 divide with 2 on both sides
 2x/2= 56/2
 x= 28
 y= 28+4 = 32
So ages of thess is 28 years
age of Bryan is 32 years