SOLUTION: erin and susan both took their dogs for a walk. together they walked 15 miles. if erin walked 3 miles less than susan, how far did susan walk with her dog?

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Question 219809: erin and susan both took their dogs for a walk. together they walked 15 miles. if erin walked 3 miles less than susan, how far did susan walk with her dog?
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
e=s-3
e+s=15
s=3-s=15
2s=15+3
2s=18
s=18/2
s=9 miles was her walk.
e=9-3=6 miles was erin's walk
Proof:
6+9=15
15=15