When I am filled, I can point the way.
When I am empty, nothing moves me.
I have two skins, one without and one within.
What am I?
I was taking a plane to China and almost missed my flight. On my way to the terminal there were 7 other girls walking in the opposite direction. Each of these girls had 8 purses and each purse had 2 dogs.
How many in all were on the plane?