[jameshart]

I'm glad these unwritten rules are all clearly expressed so that all 3rd graders understand them.

Because if you didn't realize all the things you were allowed to assume at the level of math you are doing, it might be really stressful to be given problem for homework tat's unsolvable in general, but solvable if you make the correct set of assumptions, and think you are expected to produce a solution for it.

Especially that part about 'if it's homework, who cares'. I'm sure kids are very clear on that one.