If a number is subtracted from 6, then multiplied by 6, added to 6, and finally divided by 6, the result is still 6. What is the number?
一个数减去6，再乘6，再加上6，最后除以6，得数还是6，这个数是多少．
<gadget id="calculator">6 * 6</gadget>
<output>36</output>

<gadget id="calculator">36 - 6</gadget>
<output>30</output>

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

<gadget id="calculator">5 + 6</gadget>
<output>11</output>

<result>11</result>