There is a batch of grain in the warehouse, and the Red Star transport team transported part of it. The mass ratio of the transported to the remaining is 2:7. If another 64t is transported away, the remaining grain is only 3/5 of the original grain in the warehouse. How many tons of original grain are there in the warehouse?
仓库有一批粮食，红星运输队运走了一部分，运走的与剩下的质量比是2：7，如果再运走64t，那么剩下的粮食只有仓库原有粮食的(3/5)，仓库原有粮食多少吨？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<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">(2/5) - (2/9)</gadget>
<output>8/45 = around 0.177778</output>

<gadget id="calculator">64 / (8/45)</gadget>
<output>360</output>

<result>360</result>