There are some goods in the warehouse, all (2/5) are shipped out for the first time, the rest (1/2) is shipped out for the second time, and less (1/3) is shipped out for the third time than the first time. At this time There are still 120 tons of goods. How many tons are there in this batch of goods?
仓库里有一些货物，第一次运出全部的(2/5)，第二次运出剩下的(1/2)，第三次比第一次少运(1/3)，这时还有120吨货物，这批货物共有多少吨．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(3/5) * (1/2)</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/3)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">(2/5) * (2/3)</gadget>
<output>4/15 = around 0.266667</output>

<gadget id="calculator">1 - (2/5) - (3/10) - (4/15)</gadget>
<output>1/30 = around 0.033333</output>

<gadget id="calculator">120 / (1/30)</gadget>
<output>3_600</output>

<result>3_600</result>