If you eat 28 apples in a box, you can eat 5 apples a day for 7 days. How many apples are there in this box?
一箱苹果，吃了28个，剩下的苹果每天吃5个，可以吃7天，这箱苹果一共有多少个？
<gadget id="calculator">5 * 7</gadget>
<output>35</output>

<gadget id="calculator">28 + 35</gadget>
<output>63</output>

<result>63</result>