There are 20 girls in Class 1, which is equivalent to (4/5) of boys. How many students are there in the whole class?
六1班有女生20人，相当于男生的(4/5)，全班共有学生多少人？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">20 / (4/5)</gadget>
<output>25</output>

<gadget id="calculator">25 + 20</gadget>
<output>45</output>

<result>45</result>