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Posted by on Tuesday, May 17, 2011 at 11:08pm.

how do you use the numbers 4, 5, 9, 7, and 21 to get the number 23 (using it in a number sentence) i cannot get it and its driving me crazy! please help

  • math - , Wednesday, May 18, 2011 at 2:01am

    21+(9-7)*(5-4 )=

    21 + 2*1 = 23

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