SOLUTION: Erin and Susan both took their dogs for a walk.Together they walked 15 miles.If Erin walked 3 miles lees than susan,how far did susan walk with her dog? Ok my answer was 12 but i w

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Question 241264: Erin and Susan both took their dogs for a walk.Together they walked 15 miles.If Erin walked 3 miles lees than susan,how far did susan walk with her dog? Ok my answer was 12 but i wasn't sure if it was right
Answer by College Student(505) About Me  (Show Source):
You can put this solution on YOUR website!
Good try, but incorrect. If they both walked a total of 15 miles and Susan walked 12 (according to your calculation), then Erin would have walked 9 miles (12-3=9)... but these answers would put us over the total miles walked.
So, here is how is done:
.
Since Erinwalked 3 miles less than Susan and their sum is 15 miles...
Let Susan = x
and Erin = x-3
.
So the equation now becomes: x%2B%28x-3%29=15
Does it make sense?
Now solve for x to determine how many miles Susan walked.
Then deduct 3 to determine how many miles Erin walked.
Their sum must equal 15 miles.
.
Done! :)
.
PS. Erin walked 6 miles.