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Ken Duisenberg's Puzzle of the Week
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Calendar Fractions
Write each date on a calendar as a fraction MM/DD. Every month has some fractions which are equivalent in other months. For example, January 2 (1/2) is equivalent to February 4 (2/4) and September 18 (9/18).
http://ken.duisenberg.com/potw/
saved under Mathematics Puzzles
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