The clothing store bought 400 sets of clothes and sold them in 8 days (4/5), how many sets are left?
服装店进了400套衣服，8天就卖出了(4/5)，还剩下多少套？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 - (4/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">400 * (1/5)</gadget>
<output>80</output>

<result>80</result>