One answer activity, 10 points for one correct question, 6 points for one wrong question, 36 points for answering 10 questions, and how many questions are wrongly answered.
一答题活动，对一题加10分，错一题减6分，答了10题，最后得36分，答错多少题．
<gadget id="calculator">10 * 10</gadget>
<output>100</output>

<gadget id="calculator">100 - 36</gadget>
<output>64</output>

<gadget id="calculator">10 + 6</gadget>
<output>16</output>

<gadget id="calculator">64 / 16</gadget>
<output>4</output>

<result>4</result>