There are 20 apples in a bag, take out (1/5) of this bag of apples, how many do you take out?
一袋苹果有20个，拿出这袋苹果的(1/5)，拿出了多少个．
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">20 * (1/5)</gadget>
<output>4</output>

<result>4</result>