There are 42 students in class 1 of the sixth grade who have reached the standard of physical exercise. There are 8 people who have not reached the physical exercise standard. What is the physical exercise standard rate of the students in class 1 of the sixth grade?
六年级1班学生达到体育锻炼标准的有42人．没达到体育锻炼标准的有8人，六年级1班学生体育锻炼达标率是多少．
<gadget id="calculator">42 + 8</gadget>
<output>50</output>

<gadget id="calculator">42 / 50</gadget>
<output>21/25 = around 0.84</output>

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

<gadget id="calculator">(21/25) * 1</gadget>
<output>21/25 = around 0.84</output>

<result>21/25 = around 0.84</result>