Yes 18*4 is the same as 9*8 because they both come to 72
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Possible solutions are... 1 x 72, 2 x 36, 3 x 24, 4 x 18, 6 x 12, & 8 x 9
8 + 1 = 9 5 + 4 = 9 9 + 9 = 18 ( 8 + 1 + 5 + 4 = 18) The answer is 18.
4/9 x 2/2 = 8/18 5/18 + 8/18 = 13/18
8/18 = 4/9
8/18 factor out a 2 = 4/9 ====