Add 5 to a number, subtract 5, multiply by 5, divide by 5, and the final result is 10. What is the number?
一个数加上5，减去5，乘以5，除以5，最后结果是10，这个数是多少．
<gadget id="calculator">5 / 5</gadget>
<output>1</output>

<gadget id="calculator">10 * 1</gadget>
<output>10</output>

<gadget id="calculator">5 - 5</gadget>
<output>0</output>

<gadget id="calculator">10 + 0</gadget>
<output>10</output>

<result>10</result>