There was a math exercise, there were 25 questions in total, 4 points for each correct answer, 1 point was deducted for each wrong answer or failure to answer a question, and Xiaoqin scored 75 points, so how many questions did she get right?
有一次数学练习，共有25题，每做对一题得4分，错一题或不做一题扣1分，小琴得了75分，则她做对的题数是多少个．
<gadget id="calculator">25 * 4</gadget>
<output>100</output>

<gadget id="calculator">100 - 75</gadget>
<output>25</output>

<gadget id="calculator">4 + 1</gadget>
<output>5</output>

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

<gadget id="calculator">25 - 5</gadget>
<output>20</output>

<result>20</result>