There is a batch of goods in the warehouse. (1/3) of this batch of goods is transported for the first time, and 300 tons are transported for the second time. At this time, the ratio of the number of tons transported to the remaining tons is 7:5. This batch of goods How many tons are there in total?
仓库有一批货物，第一次运走这批货物的(1/3)，第二次运走300吨，这时运走的吨数与剩下的吨数比是7：5，这批货物一共有几吨？
<gadget id="calculator">7 + 5</gadget>
<output>12</output>

<gadget id="calculator">7 / 12</gadget>
<output>7/12 = around 0.583333</output>

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

<gadget id="calculator">(7/12) - (1/3)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">300 / (1/4)</gadget>
<output>1_200</output>

<result>1_200</result>