For a pile of goods, (1/3) of the total weight is transported for the first time, and 6 tons are transported for the second time. At this time, the ratio of the weight of the transported goods to the remaining weight is 2:3. How many tons does this pile of goods weigh in total?
一堆货物，第一次运走总重量的(1/3)，第二次运走6吨，这时运走的和剩下的重量比为2：3，这堆货物共重多少吨？
<gadget id="calculator">3 + 2</gadget>
<output>5</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

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

<gadget id="calculator">(2/5) - (1/3)</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">6 / (1/15)</gadget>
<output>90</output>

<result>90</result>