I seriously doubt that. Besides, they had a tool with which to check their answers.
On Jan 21, 2013, at 11:57 AM, Joe Niederberger <firstname.lastname@example.org> wrote:
> My guess is that if only 18 out of 20 children failed to work this problem to a successful conclusion, it was not due to not "seeing the trick". My guess it it had to do with (lack of) tidy record keeping and double checking.