This is not really a 'high school rule' but I am almost certain that in a standardized test like the SAT you should round up for such a question, and not round

This is not really a 'high school rule' but I am almost certain that in a standardized test like the SAT you should round up for such a question, and not round down to a number that doesn't satisfy the question, since that would just be logically wrong and fail to correctly answer the question. This was the kind of tricky question that would often annoy me in high school or college tests since teachers and professors were not always good at catching such ambiguity and resolving it in the most logical way. Standardized tests are usually pretty good about this.