In a quick calculation competition, the scores of each question are the same. Among the first 20 questions, Xiao Ming got 15 correct, and among the rest of the questions, he got half of the correct questions. In the end, he got a total of 50. If the full score is 100 points, how many points did Xiao Ming get right?
在一次速算比赛中，每道题的分数是一样的，前20道题中，小明做对了15道，余下的题中，他做对的题数是做错的一半，最后，一共得了50分，如果满分是100分，那么小明做对了多少道？
<gadget id="calculator">15 - 20</gadget>
<output>-5</output>

<gadget id="calculator">15 + (-5)</gadget>
<output>10</output>

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

<gadget id="calculator">10 / 1</gadget>
<output>10</output>

<gadget id="calculator">15 + 10</gadget>
<output>25</output>

<result>25</result>