SOLUTION: Ten years ago a mother was three times as old as her son was. The sum of their ages today is 60. How old is the mother today?

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Question 497131: Ten years ago a mother was three times as old as her son was. The sum of their ages today is 60. How old is the mother today?
Answer by jorel1380(3719) About Me  (Show Source):
You can put this solution on YOUR website!
m-10=3(s-10)
m=3s-30+10
m=3s-20
m+s=60
3s-20+s=60
4s=80
s=20
m=40
The mother is 40. The son is 20.