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2014-05-27T18:24:27+08:00

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If 18% were present, then 82% did not come.

82% = 0.82

Getting 82% of 315, we have
315 · 0.82 = 258.3

We can't have decimal to represent people, so 258 members did not come.
0
Umm...howd you get the 82?...
100% - 18%. Sorry for the late response