The station transports a batch of goods. On the first day, (1/3) and 20 tons of all goods are transported away, and (1/4) and 30 tons of all goods are transported on the second day. At this time, there are still 30 tons of goods in the station. How many tons are there in total?
车站运走一批货物，第一天运走全部货物的(1/3)又20吨，第二天运走全部货物的(1/4)又30吨，这时车站还存货物30吨．这批物一共有多少吨？
<gadget id="calculator">30 + 20 + 30</gadget>
<output>80</output>

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

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/3) - (1/4)</gadget>
<output>5/12 = around 0.416667</output>

<gadget id="calculator">80 / (5/12)</gadget>
<output>192</output>

<result>192</result>