1/5 went on Thursday.
5/8 of those 4/5, went on Friday, that means 1/2 went
That means 1/5 + 1/2, being 7/10 went
Therefore. 3/10 of them didn't go at all.
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1/5 went on Thursday.
5/8 of those 4/5, went on Friday, that means 1/2 went
That means 1/5 + 1/2, being 7/10 went
Therefore. 3/10 of them didn't go at all.