There are 20 questions in one test paper, 6 points are awarded for each correct answer, and 4 points will be deducted for wrong answers or non-answers. As a result, Xiaohong scored 70 points. How many questions did Xiaohong answer correctly?
一张试卷共20题，答对一题得6分，打错或不答都要倒扣4分，结果小红得了70分，小红答对了几道题？
<gadget id="calculator">6 * 20</gadget>
<output>120</output>

<gadget id="calculator">120 - 70</gadget>
<output>50</output>

<gadget id="calculator">6 + 4</gadget>
<output>10</output>

<gadget id="calculator">50 / 10</gadget>
<output>5</output>

<gadget id="calculator">20 - 5</gadget>
<output>15</output>

<result>15</result>