In a math competition, 10 points are awarded for a correct answer, -5 points for a wrong answer, and 70 points for Xiao Ming, who answered 8 questions correctly. How many questions are there in this competition?
一次数学竞赛答对一题得10分，答错一题得-5分，小明得了70分，共答对8道题，这次竞赛共多少道题？
<gadget id="calculator">80 - 70</gadget>
<output>10</output>

<gadget id="calculator">10 / 5</gadget>
<output>2</output>

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

<result>10</result>