There are 5 test questions in one exam, and those who get the 1st, 2nd, 3rd, 4th, and 5th questions correctly account for 95%, 80%, 79%, 74%, and 85% of the test takers. If they get 3 questions right or 3 What is the pass rate of this exam at least?
一次考试共有5道试题，做对第1、2、3、4、5题的分别占参加考试人数的95%、80%、79%、74%、85%，如果做对3道题或3道以上的为合格，那么这次考试的合格率至少是多少．
<gadget id="calculator">80 + 95 + 85 + 79 + 74</gadget>
<output>413</output>

<gadget id="calculator">500 - 413</gadget>
<output>87</output>

<gadget id="calculator">87 / 3</gadget>
<output>29</output>

<gadget id="calculator">100 - 29</gadget>
<output>71</output>

<gadget id="calculator">71 / 100</gadget>
<output>71/100 = around 0.71</output>

<gadget id="calculator">100 / 100</gadget>
<output>1</output>

<gadget id="calculator">(71/100) * 1</gadget>
<output>71/100 = around 0.71</output>

<result>71/100 = around 0.71</result>