There are 8 questions in total, and 10 points will be awarded for each correct answer. 5 points will be deducted for a wrong answer, and Wang Qiang will get 65 points in total. How many questions did he answer correctly?
知识抢答竞赛，共8道题，答对一题得10分．答错一题倒扣5分，王强共得65分，他答对了几道题？
<gadget id="calculator">8 * 10</gadget>
<output>80</output>

<gadget id="calculator">80 - 65</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">8 - 1</gadget>
<output>7</output>

<result>7</result>