If a number is subtracted from 10, then multiplied by 10, added to 10, and then divided by 10, the result is 11, what is the number?
一个数减去10，再乘以10，加上10，再除以10，结果得11，则这个数是多少．
<gadget id="calculator">11 * 10</gadget>
<output>110</output>

<gadget id="calculator">110 - 10</gadget>
<output>100</output>

<gadget id="calculator">100 / 10</gadget>
<output>10</output>

<gadget id="calculator">10 + 10</gadget>
<output>20</output>

<result>20</result>