A bunch of goods have been transported away (3/5), and there are still 120 tons left. How many tons were shipped?
一堆货物运走了(3/5)，还剩下120吨没运走．运走了多少吨？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">120 / (2/5)</gadget>
<output>300</output>

<gadget id="calculator">300 - 120</gadget>
<output>180</output>

<result>180</result>