In a test, Li Bing got 16 questions right and 4 questions wrong. What is the correct rate of Li Bing's answers in this test?
李冰在一次测验中，做对的题数是16道，错了4道，李冰在这次测验中答题的正确率是多少．
<gadget id="calculator">16 + 4</gadget>
<output>20</output>

<gadget id="calculator">16 / 20</gadget>
<output>4/5 = around 0.8</output>

<result>4/5 = around 0.8</result>