Recall that GPT-3 isn't trying to get the right answer, it's trying to plausibly complete the document. If the document is could be an 8th grade homework assign

Recall that GPT-3 isn't trying to get the right answer, it's trying to plausibly complete the document. If the document is could be an 8th grade homework assignment, it may answer as a plausible 8th grader would, which includes a decent chance that it will give a wrong answer. Try writing it more like an exercise and answer guide from a graduate textbook, and you'll predispose the model more towards getting the right answer.