There is a pile of 20 tons of sand on the construction site. On the first day, 1/5 of the total amount is removed, and the remaining 40% is removed on the second day. How many tons are left?
工地有一堆沙20吨，第一天运走总数的(1/5)，第二天运走剩下的40%，还剩多少吨？
<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">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">20 * (4/5) * (2/5)</gadget>
<output>32/5 = around 6.4</output>

<gadget id="calculator">20 - 4 - (32/5)</gadget>
<output>48/5 = around 9.6</output>

<result>48/5 = around 9.6</result>