math
posted by mary .
Max is 5 years younger than Michael . 4 years ago the sum of their ages was 25. How old are they ?

present age:
michael  x
max  x5
4 years ago:
michael  x4
max  x  9
x4 + x9 = 25
2x = 38
x = 19
Michael is now 19 , and Max is now 14
check: 4 years ago , Michael was 15 and Max was 10
was the sum of their ages at that time 25? YES