There are 20 footballs in the school, footballs are less than basketballs (1/5), how many basketballs are there?
学校有20个足球，足球比篮球少(1/5)，篮球有多少个？
<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>