Xiaohong participated in the "Exploration Cup" mathematics competition, a total of 10 questions, 10 points for each correct answer, 5 points for each wrong answer, and 85 points for Xiaohong in the end. How many questions did she get right? ?
小红参加"探索杯"数学比赛，一共10道题，每做对一道题得10分，不做或每做错一道题扣5分，小红最后得85分，她做对了几道题？
<gadget id="calculator">10 * 10</gadget>
<output>100</output>

<gadget id="calculator">100 - 85</gadget>
<output>15</output>

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

<gadget id="calculator">15 / 15</gadget>
<output>1</output>

<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<result>9</result>