
I will give you an example of why even very simple mathematics can be
very strange. Lets say I borrowed $100 from a friend, went into a shop
and lost them. Then I met a girlfriend and borrowed $50 from her. I
bought two chocolate boxes worth $10 each. Now I am left with $30. I
gave these $30 to my friend, now I owe him $70, and I owe my girlfriend
$50, thats $120 in total, plus I have 2 chocolate boxes, thats $140.
Now my question is the hell is an extra $10?
Now how interesting is this, such a simple exercise and yet we manage to loose $10 as a result.