If △+□+○=23, □*2+○*2=22, then △=how much
如果△+□+○=23，□*2+○*2=22，那么△=多少
<gadget id="calculator">22 / 2</gadget>
<output>11</output>

<gadget id="calculator">23 - 11</gadget>
<output>12</output>

<result>12</result>