For a pile of goods, 3/10 of the total number has been transported. If another 12 tons are transported, the ratio of the number of tons transported to the total number is 1:2. How many tons are there in this pile of goods?
一堆货物，已运走总数的(3/10)，如果再运12吨，这时已运的吨数与总数的比是1：2，原来这堆货物有多少吨？
<gadget id="calculator">1 + 2</gadget>
<output>3</output>

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

<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

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

<gadget id="calculator">12 / (1/30)</gadget>
<output>360</output>

<result>360</result>