Xiaohong participates in a math competition. There are 25 compulsory questions. She gets 4 points for each correct answer and 2 points for each wrong answer. She has a total of 70 points. How many questions did Xiaohong answer correctly?
小红参加数学竞赛，必答题有25道，每答对一道得4分，错答一道扣2分，她一共得了70分，小红答对了多少题？
<gadget id="calculator">25 * 4</gadget>
<output>100</output>

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

<gadget id="calculator">4 + 2</gadget>
<output>6</output>

<gadget id="calculator">30 / 6</gadget>
<output>5</output>

<gadget id="calculator">25 - 5</gadget>
<output>20</output>

<result>20</result>