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20+18+13+9=60
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9 plus 11 (20) plus 15 (35) plus 18 is equal to 53
4/9 x 2/2 = 8/18 5/18 + 8/18 = 13/18
7/20 + 9/10 = 7/20 + 18/20 = 25/20 = 5/4
7 + 1/6 + 13/18 = 126/18 + 3/18 + 13/18 = 142/18 = 71/9
18/26 = 9/13