Subtract 8 from a number and multiply it by 5. The result is 20. What is this number?
一个数减去8，乘以5，其结果是20，求这个数是？
<gadget id="calculator">20 / 5</gadget>
<output>4</output>

<gadget id="calculator">4 + 8</gadget>
<output>12</output>

<result>12</result>