There is a batch of goods in the market. On the first day, 2/5 of the total amount was shipped away. On the second day, 4 tons more than on the first day were shipped. At this time, there are still 20 tons left. How many tons are there in this batch of goods?
商场上有一批货，第一天运走了总数的(2/5)，第二天运的比第一天多4吨，这时还剩20吨，这批货物共有多少吨？
<gadget id="calculator">20 + 4</gadget>
<output>24</output>

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

<gadget id="calculator">(2/5) * 2</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">24 / (1/5)</gadget>
<output>120</output>

<result>120</result>