There is a batch of goods in the warehouse, and the quality ratio of the goods transported away to the remaining goods is 7:2. If another 64 tons are transported away, the remaining goods are only 1/5 of the original goods in the warehouse, and the original goods in the warehouse How many tons?
仓库有一批货物，运走的货物与剩下的货物的质量比为7：2，如果又运走64吨，那么剩下的货物只有仓库原有货物的(1/5)，仓库原有货物多少吨？
<gadget id="calculator">2 + 7</gadget>
<output>9</output>

<gadget id="calculator">2 / 9</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(2/9) - (1/5)</gadget>
<output>1/45 = around 0.022222</output>

<gadget id="calculator">64 / (1/45)</gadget>
<output>2_880</output>

<result>2_880</result>