For a batch of goods, 40% of the goods were transported for the first time, 50 tons for the second time, and 35% for the third time, which happened to be finished. How many tons is this shipment in total?
一批货物，第一次运走了40%，第二次运走了50吨，第三次运走了35%，正好运完．这批货物一共有多少吨？
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">35 / 100</gadget>
<output>7/20 = around 0.35</output>

<gadget id="calculator">1 - (2/5) - (7/20)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">50 / (1/4)</gadget>
<output>200</output>

<result>200</result>