There are 20 boys in Class 1, less than girls (1/5). How many girls are there? How many columns
六1班有男生20人，比女生少(1/5)，女生有多少人？列式多少
<gadget id="calculator">1 / 5</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">20 / (4/5)</gadget>
<output>25</output>

<result>25</result>