Hongye Garment Factory received an order to process a batch of export garments, which was required to be completed within 20 days, with a daily production of 400 pieces. In fact, 500 pieces can be produced every day, so how many days can the production task be completed?
红叶服装厂接到加工一批出口服装的订单，要求在20天内完成，每天需生产400件．实际每天能生产500件，这样多少天就可以完成生产任务？
<gadget id="calculator">20 / 500</gadget>
<output>1/25 = around 0.04</output>

<gadget id="calculator">400 * (1/25)</gadget>
<output>16</output>

<result>16</result>