A pile of goods, after transporting 1/3 of the goods on the first day and the second day, there are still 30 tons of goods left in the warehouse. How many tons of goods are there in the warehouse?
一堆货物，第一天和第二天各运走货物的(1/3)后，仓库还剩下30吨货物，仓库原来有货物多少吨？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

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

<gadget id="calculator">30 / (1/3)</gadget>
<output>90</output>

<result>90</result>