Simple calculation of 8 out of 21 times 25 out of 18 times 63

21=3×7,18=2×9；8=2×4,63=7×9
Use 7 and 9 of 63 to reduce 7 and 9 of 21 and 18 respectively, and then use 2 of 8 to reduce 2 of 18, leaving 25 / 3 times 4, that is 100 / 3

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