100 people take part in the test and are required to answer five test questions, and it is stipulated that those who answer 3 or more questions correctly are qualified for the test. The test results are: 81 people answered the first question correctly, 91 people answered the second question correctly, and 91 people answered the second question correctly. There are 85 people who answered the third question, 79 people who answered the fourth question correctly, and 74 people who answered the fifth question correctly. So at least how many people are qualified?
100个人参加测试，要求回答五道试题，并且规定凡答对3题或3题以上的为测试合格，测试结果是：答对第一题的有81人，答对第二题的有91人，答对第三题的有85人，答对第四题的有79人，答对第五题的有74人，那么至少有几人合格？
<gadget id="calculator">100 - 81</gadget>
<output>19</output>

<gadget id="calculator">100 - 91</gadget>
<output>9</output>

<gadget id="calculator">100 - 85</gadget>
<output>15</output>

<gadget id="calculator">100 - 79</gadget>
<output>21</output>

<gadget id="calculator">100 - 74</gadget>
<output>26</output>

<gadget id="calculator">19 + 9 + 15 + 21 + 26</gadget>
<output>90</output>

<gadget id="calculator">90 / 3</gadget>
<output>30</output>

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

<result>70</result>