There are 28 boys in a chorus, and boys are 20% less than girls. How many girls are there? How much is the column.
某合唱队有男生28人，男生比女生少20%，女生有多少人？列式为多少．
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

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

<gadget id="calculator">28 / (4/5)</gadget>
<output>35</output>

<result>35</result>