The teacher gave 25 fill-in-the-blank questions, and stipulated that 4 points would be awarded for each correct answer, and 1 point would be deducted for not filling in or filling in incorrectly. Xiaohua got 70 points. So, how many questions did he fill in correctly?
老师出了25个填空题，规定填对一个给4分，不填或填错倒扣1分，小华得了70分．那么，他共填对多少个题？
<gadget id="calculator">25 * 4</gadget>
<output>100</output>

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

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