I walk 3 miles north, then 2 miles south, then 5 miles north, then 6 miles south. Where did I end up.
Suppose you start at the 0-mile marker.
I walk 3 miles north,
So you are now at the 3-mile marker.
then 2 miles south,
So you are now at the 1-mile marker.
then 5 miles north,
So you are now at the 6-mile marker.
Then 6 miles south.
So you are now back at the 0-mile marker.
Where did I end up?
Right where you started!
Edwin