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0 / 60 seg.
Draw four rectangles on a piece of paper. Put nine x's in the four rectangles so that there is an uneven number of x's in each rectangle
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D
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S
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X
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Clue
THE PROFESSOR HAS TO ADD THE REST OF THE DIGITS, FIND THE NEAREST NUMBER TO THE SUM THAT IS DIVISIBLE BY 9 AND GET THE DIFFERENCE. SO, JOHN GAVE THE NUMBER 9646 TO THE PROFESSOR. THE PROFESSOR WILL ADD THE NUMBERS (9 + 6 + 4 + 6) TO GET 25. THE NEAREST NUMBER TO 25 THAT IS DIVISIBLE BY 9 IS 27. AND THE CROSSED OUT NUMBER IS 27 - 25. THIS IS A MATHS TRICK THAT RELIES ON THE POWER OF 9
DRAW AN S IN FRONT OF THE IX AND IT SPELLS SIX. THE LINE NEED NOT BE STRAIGHT
DRAW ONE LARGE RECTANGLE. THEN DRAW THE THREE SMALLER RECTANGLES WITHIN THE LARGE RECTANGLE. PLACE THREE X'S IN EACH SMALL RECTANGLE. THERE WILL BE NINE X'S IN THE LARGE RECTANGLE
28, 4, 17. WRITING THE 24TH LETTER OF THE ALPHABET FOR EACH 24, THE 22ND LETTER OF THE ALPHABET FOR EACH 22, AND THE 9TH LETTER OF THE ALPHABET FOR EACH 9 REVEALS: XXVIII IV XVII IT IS NOW CLEAR THAT THE COMBINATION IS WRITTEN IN ROMAN NUMERALS. THE ONLY SET OF 3 ROMAN NUMERALS THAT FITS THIS ARRANGEMENT IS: XXVIII IV XVII OR 28, 4, 17
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