A football team has 69 players, arranged in 3 rows with 21 players in each row, how many people are left standing outside the team?
足球队有队员69人，排成3排，每排21人，还剩多少人站在队伍外？
<gadget id="calculator">21 * 3</gadget>
<output>63</output>

<gadget id="calculator">69 - 63</gadget>
<output>6</output>

<result>6</result>