A stranger walks into a bar and puts a pound coin on the counter and asks for half a pint of bitter. The barmaid asks him whether he would like Guinness or Worthington. The stranger asks for Guinness. Another complete stranger comes into the bar, puts a pound on the counter and also asks for half a pint of bitter. The barmaid immediately pulls half a pint of Guinness. How did she know what the second man, who was completely unknown to her, wanted?
(think in a crooked way for this one)
Half a pint of Guinness costs exactly one pound, while Worthington costs 90p. The first stranger put down a £1 coin on the counter. The second man put down a 50p piece and five 10p coins. If he had wanted Worthington he would only have put down 90p.
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