A certain school has 320 tons of coal in storage, and just burned 4/5 of the total in 16 days. According to this calculation, how many days can these coals be burned?
某校存煤320吨，16天正好烧了总数的(4/5)，照这样计算，这些煤还可以烧多少天？
<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">(4/5) / 16</gadget>
<output>1/20 = around 0.05</output>

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

<result>4</result>