A mathematics competition was held in the sixth grade. A total of 10 questions were asked, 10 points were awarded for one correct answer, and 5 points were deducted for wrong answers or non-answers. Xiao Ming scored 70 points, how many questions did he answer correctly?
六年级举行数学竞赛，一共出了10道题，答对一道得10分，答错一道或不答倒扣5分．小明得了70分，他答对了几道题？
<gadget id="calculator">10 * 10</gadget>
<output>100</output>

<gadget id="calculator">100 - 70</gadget>
<output>30</output>

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

<gadget id="calculator">30 / 15</gadget>
<output>2</output>

<gadget id="calculator">10 - 2</gadget>
<output>8</output>

<result>8</result>