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given a number of 2 digits plus 27 you should obtain the same number but with its digits inverted
 2 feb. 2014
 #1
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the question is, what is the number!?? !
 2 feb. 2014
 #2
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47. Quite easy. I worked from the 7 + what can give me an answer i'm looking for. Then the 4 naturally fit that.
 7 feb. 2014

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