The school holds a safety knowledge quiz contest, where 3 points are awarded for a correct answer and 2 points are deducted for a wrong answer. Xiao Ming answered 25 questions in total and got 50 points. How many questions did Xiao Ming get wrong?
学校举行安全知识问答竞赛，答对一题得3分，答错一题扣2分．小明共抢答了25道题，得到的分数是50分．小明答错了几道题？
<gadget id="calculator">25 * 3</gadget>
<output>75</output>

<gadget id="calculator">75 - 50</gadget>
<output>25</output>

<gadget id="calculator">3 + 2</gadget>
<output>5</output>

<gadget id="calculator">25 / 5</gadget>
<output>5</output>

<result>5</result>