To transport a batch of goods, the first shipment of this batch of goods (1/5), the second shipment of 40% of this batch of goods, there are 40 tons left, how many tons of this batch of goods are there?
要运一批货物，第一次运了这批货物的(1/5)，第二次运了这批货物的40%，还剩40吨，这批货物共有几吨？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

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

<gadget id="calculator">1 - (1/5) - (2/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">40 / (2/5)</gadget>
<output>100</output>

<result>100</result>