Considering the situation described of the sack, and that the ball was originally at the 31 yard line, the ball ends up at the 21 yard line.
We have to consider a few things.
Researching this problem on the internet, we found that originally the team had the ball at their own 31 yard line, that is, on the defense. 10 yards back from that is the 21 yard line, hence, after the sack, the ball ends up at the 21 yard line.
A similar problem, also involving a football situation, is given at https://brainly.com/question/14350453
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