Sunshine Supermarket has imported 21 boxes of mineral water, 8 bottles in each box, and plans to sell them out in a week. How many bottles are sold per day on average?
阳光超市运进21箱矿泉水，每箱8瓶，计划一个星期卖完，平均每天卖多少瓶？
<gadget id="calculator">21 / 7</gadget>
<output>3</output>

<gadget id="calculator">8 * 3</gadget>
<output>24</output>

<result>24</result>