There are only three questions in the final of the Multiple Intelligences competition. It is known: 1. 25 students from a certain school participated in the competition, and each student solved at least one problem; 2. Of all the students who did not solve the first problem, the number of people who solved the second problem was equal to the number of people who solved the third problem. 2 times: 3 students who only solved the first problem were 1 more than the remaining students who solved the first problem; half of the 4 students who solved only one problem did not solve the first problem, then only What is the number of students who gave the second question?
在多元智能大赛的决赛中只有三道题．已知：1某校25名学生参加竞赛，每个学生至少解出一道题；2在所有没有解出第一题的学生中，解出第二题的人数是解出第三题的人数的2倍：3只解出第一题的学生比余下的学生中解出第一题的人数多1人；4只解出一道题的学生中，有一半没有解出第一题，那么只解出第二题的学生人数是多少．
<gadget id="calculator">3 * 2</gadget>
<output>6</output>

<result>6</result>