Question

Mike is 4 years older than ron. in two years, the sum of their ages will be 84. how old are they now?

Answer 1

let r be Ron's age.
let m be Mike's age.
m=r+4
m+r=84
m=84-r
r+4=84-r
2r=80
r=40
m=44
Ron is 40 and Mike is 44