There is a batch of goods in the warehouse, and (1/3) of this batch of goods is transported away for the first time, and 9 tons are transported away for the second time. How many tons were 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9吨，这时已运走的与未运走的吨数比为7：5，这批货物原来共有多少吨？
<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">9 / (1/4)</gadget>
<output>36</output>

<result>36</result>