There are 65 apples in a box, and 5 apples are eaten every day for 7 days. How many apples are left in this box?
一箱苹果有65个，每天吃5个，吃了7天，这箱苹果还剩下多少个？
<gadget id="calculator">5 * 7</gadget>
<output>35</output>

<gadget id="calculator">65 - 35</gadget>
<output>30</output>

<result>30</result>