There are 20 girls in the sixth grade, which is 4/5 of the boys. How many people are there in the class?
六年级有女生20人，是男生人数的(4/5)，全班有多少人？
<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>