There are 10 three-good students in Class 1 and 40 non-three-good students. How many percent of the whole class are three-good students? What is the correct column
六一班有三好学生10名，非三好学生40名，三好学生是全班的百分之几？正确列式为多少
<gadget id="calculator">10 + 40</gadget>
<output>50</output>

<gadget id="calculator">10 / 50</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>