There are 40 students in a sixth grade class in a certain school. In a math test, the ratio of the number of passers to the number of failers is 4:1. What is the passing rate for this test.
某校六年级一班共有40名学生，在一次数学测验中及格人数与不及格人数比是4：1．这次测验的及格率是多少．
<gadget id="calculator">4 + 1</gadget>
<output>5</output>

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

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

<gadget id="calculator">(4/5) * 1</gadget>
<output>4/5 = around 0.8</output>

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