There are 10 questions in the math competition. If you answer a question correctly, you will get 10 points. If you do a wrong question, you will get 6 points. If you don’t do it, you will get no points and no points will be deducted. Xiao Ming did all 10 questions and got 68 points. How many questions did he get wrong?
数学竞赛共10题，做对一题得10分，做错一题倒扣6分，不做不得分也不扣分，小明10题全做，得了68分，他做错了多少题．
<gadget id="calculator">10 * 10</gadget>
<output>100</output>

<gadget id="calculator">100 - 68</gadget>
<output>32</output>

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

<gadget id="calculator">32 / 16</gadget>
<output>2</output>

<result>2</result>