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posted by k 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
21+(9-7)*(5-4 )= 21 + 2*1 = 23
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