Now i must point out that relatives of mine live in this country here and they are from farming backgrounds, some even still live in the homes built a 90 years ago from the local trees...
So we can relate to this mathematics problem in the video below...
Its just amazing that someone has made a video of such simple maths, whats so funny that the people laugh at it...
http://au.youtube.com/watch?v=Bfq5kju627c