Some students in the preparatory class 1 participated in the mathematics competition organized by the district. There were only 25 multiple-choice questions in the test paper. Among them, 4 points were awarded for correct answers, and 1 point was deducted for wrong answers. Did not do 4 questions, 69 points, how many questions did he answer correctly?
预备1班有部分同学参加区组织的数学竞赛，试卷仅有25道选择题，其中答对得4分，答错一道倒扣1分，不答题不得分也不扣分，小杰这次比赛有4题没做，69分，问他答对了多少题？
<gadget id="calculator">25 - 4</gadget>
<output>21</output>

<gadget id="calculator">21 * 4</gadget>
<output>84</output>

<gadget id="calculator">84 - 69</gadget>
<output>15</output>

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

<gadget id="calculator">15 / 5</gadget>
<output>3</output>

<gadget id="calculator">21 - 3</gadget>
<output>18</output>

<result>18</result>