There is a pile of sand weighing 20 tons on the construction site, 1/5 of the total amount was removed on the first day, and 25% of the total amount was removed on the second day. How many tons more were shipped the next day than the first day?
工地有一堆沙重20吨，第一天运走了总数的(1/5)，第二天运走了总数的25%．第二天比第一天多运多少吨？
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

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

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

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

<gadget id="calculator">5 - 4</gadget>
<output>1</output>

<result>1</result>