Xiao Ming participated in a math competition. He got 4 points for answering a question correctly, and deducted 1 point for a wrong answer. He answered 25 questions in total in this competition, and he scored 60 points. How many questions did he answer correctly?
小明参加一次数学竞赛，答对一题得4分，答错一题扣1分，这次竞赛一共答了25道题，他得了60分，答对了多少道题．
<gadget id="calculator">25 * 4</gadget>
<output>100</output>

<gadget id="calculator">100 - 60</gadget>
<output>40</output>

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

<gadget id="calculator">40 / 5</gadget>
<output>8</output>

<gadget id="calculator">25 - 8</gadget>
<output>17</output>

<result>17</result>