>>846
本文は、Homer drinks at least one bottle of beer every day for 30 days.
show that for every k<=30, there exists a collection of days such that
the total number of beers Homer drinks during these days is divisible by k.
です。おそらく、ｋは"a collection of days"と思います。日にちのかたまりの数
さっきの例でいうとｋ＝３とおもいます。