A simple method is used to calculate. 4 of 9 + 1 of 16 + 15 of 16 + 5 of 9, 30 of 21-9 of 20 A simple method is used to calculate. 4 / 9 + 1 / 16 + 15 / 16 + 5 / 9, 30 / 21-20 / 9-20 / 11
(4/9+5/9)+(1/16+15/16)=2
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