Hint to riddle #30: Incorrectly Wired Tea & Tea and Coffee Machine
30. A drinks machine offers three selections - Tea, Coffee or Random but the machine has been wired up wrongly so that each button does not give what it claims. If each drink costs 50p, how much minimum money do you have to put into the machine to work out which button gives which selection ?
There is a strong clue in the wording of this puzzle. It says 'each button does not give what it claims.' This is significant. It does not say that each button might not give what it claims. It is much more specific than that.
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