math
posted by chris .
A troop of boy scouts hiked to a camp in the woods for supper.They returned home by a apth across lots,whih was two and a half miles shorter than the road which they went.the scout master said that they had walked 7 miles in all.how many miles they walked before supper?

L is length to supper.
L2 is the length home.
7=L + L2
solve for L