There are three questions A, B, and C in the school mathematics competition. There are 25 people who got at least one right, among which 10 people got A right, 13 got B right, and 15 got C right. ． If there is only one person who gets all three questions right, how many people get two questions right?
学校数学竞赛出了A，B，C三道题，至少做对一道的有25人，其中做对A题的有10人，做对B题的有13人，做对C题的有15人．如果三道题都做对的只有1人，那么只做对两题的共有多少人．
<gadget id="calculator">10 + 13 + 15</gadget>
<output>38</output>

<gadget id="calculator">1 * 2</gadget>
<output>2</output>

<gadget id="calculator">38 - 2 - 25</gadget>
<output>11</output>

<result>11</result>