I need help understanding the final answer. If the answer is the ages they are now, why do we need to know the sum of their ages in 2 years? Confusing.

Thanks.

Mike is 4 years older than Ron. In two years, the sum of their ages will be 84. How old are they now?

R=Ron’s age now

R+4=Mike’s age now

R+2+R+4+2 =84

2R+8 =84

2R+8-8=84-8

2R=76

R=38

Ron is 38. Mike is 42.