(a) Egyptian Hieroglyphs
(b) Roman Numerals
(c) Attic Greek Numerals
(d) Babylonian Cuneiform, etc.,
Someone is asked to think of a 2 digit number he is then requested to multiply the tens digit by 5, add 7, double, add the units digits of the original number and announce the final result. From the result the conjurer secretly subtracts 14 and obtains the original number.
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