There are 50 questions in the quick calculation competition. The scoring standard is: 3 points for answering a question correctly, 1 point for not answering a question, and 1 point deducted for a wrong answer. Li Qiang didn't answer 5 questions and got exactly 100 points. How many questions did he get wrong?
速算比赛试题共50道，评分标准是：答对一题得3分，不答一题得1分，答错一题扣1分．李强有5题没有答，刚好得100分，他答错多少道题．
<gadget id="calculator">3 * 50</gadget>
<output>150</output>

<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">5 * 2</gadget>
<output>10</output>

<gadget id="calculator">150 - 10 - 100</gadget>
<output>40</output>

<gadget id="calculator">3 + 1</gadget>
<output>4</output>

<gadget id="calculator">40 / 4</gadget>
<output>10</output>

<result>10</result>