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<p>This was precisely my reaction. “Some” implies that the number of marbles given was between 2 and 9. Actually, I think it <em>really</em> implies between 2 and 4 or 6, because a good writer would say “half” if the number given was 5, and “most” if it were between 7 and 9. 6 is in a gray area. :D</p>
<p>I was always driven crazy by estimating problems where the quantities were too small and the precise answer was too obvious. I will proudly say that when my S was in K I won the parents’ night estimating contest of jelly beans in a jar, because I estimated the number on one level and multiplied by an estimate of the number of levels in the jar. I’m not competitve or anything. :D</p>