SOLUTION: Marge is twice as old as Consuelo. The sum of their ages seven years ago was 13. How old are they now?

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Question 163067: Marge is twice as old as Consuelo. The sum of their ages seven years ago was 13. How old are they now?
Answer by edjones(8007) About Me  (Show Source):
You can put this solution on YOUR website!
m=2c
(m-7)+(c-7)=13
(2c-7)+(c-7)=13 substitute 2c for m.
2c-7+c-7=13
3c-14=13
3c=27
c=9 y.o.
m=18 y.o.
.
Ed