As an anecdote:

Two mathematicians sit in a restaurant. One went to the toilet. The second called the waitress and asked her:

“Girl, could you, when I ask the question, just answer x in a cube for three?”

She agreed.



His colleague returns and he begins a discussion.

“People know mathematics very well. Here we argue on a cocktail of cognac that the arbitrary waitress knows the integral number? He joyfully agreed.



He calls the waitress and asks:

“Well, girl, do you know what is equal to the integral x square by de x? “”

She replies, “X in a cube for three.” A colleague in shock. Then the waitress added:

Plus a constant!



And now history.

My friend and I, a professor of mathematics, are traveling from Toronto to Boston. On the way we go to McDonald’s and order two identical combos. The seller calls the price: 13. and 73.

My friend said it was wrong and the price should be fair.

What she answered:

The tax is charged from the total amount. “”