Add 5 to a number, multiply by 5, subtract 5, and divide by 5 to get 5. What is this number?
一个数加上5，再乘5，然后再减去5，最后除以5，结果为5．这个数是多少呢？
<gadget id="calculator">5 * 5</gadget>
<output>25</output>

<gadget id="calculator">25 + 5</gadget>
<output>30</output>

<gadget id="calculator">30 / 5</gadget>
<output>6</output>

<gadget id="calculator">6 - 5</gadget>
<output>1</output>

<result>1</result>