20 tons of goods, shipped 5 times, how much of this batch of goods was shipped 4 times
20吨货物，5次运完，4次运了这批货物的多少
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<result>4/5 = around 0.8</result>