A batch of goods was shipped, 1/3 of the total amount was shipped on the first day, and 9 tons were shipped on the second day. At this time, the ratio of the number of tons shipped to the remaining tons is 7:5. How many tons are there in this batch of goods?
运送一批货，第一天运了总数的(1/3)，第二天运了9吨，这时已运的与剩下的吨数比是7：5，这批货物有多少吨？
<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>