There are only 25 multiple-choice questions in a math test paper, 4 points are awarded for each correct answer, and 1 point is deducted for each wrong answer. Xiaohua did all the test questions and got a total of 70 points. How many questions did Xiaohua get right?
一张数学试卷，只有25个选择题，做对一题得4分，做错一题扣1分．小华做了全部试题，一共得了70分，小华做对了多少题．
<gadget id="calculator">25 * 4</gadget>
<output>100</output>

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

<gadget id="calculator">4 + 1</gadget>
<output>5</output>

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

<gadget id="calculator">25 - 6</gadget>
<output>19</output>

<result>19</result>