There are 20 footballs in the school. There are more footballs than basketballs (1/4). How many basketballs are there?
学校有20个足球，足球比篮球多(1/4)，篮球有多少个？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 + (1/4)</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">20 / (5/4)</gadget>
<output>16</output>

<result>16</result>