For a batch of fabrics, 3/10 of the total amount is used on the first day, and 64 meters more are used on the second day than on the first day. At this time, the ratio of the used fabrics to the rest is 7:2. How many meters is this batch of fabric?
一批布料，第一天用去总数的(3/10)，第二天比第一天多用去64米，这时用去的布料和剩下的比是7：2．这批布料共有多少米？
<gadget id="calculator">7 + 2</gadget>
<output>9</output>

<gadget id="calculator">7 / 9</gadget>
<output>7/9 = around 0.777778</output>

<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">(3/10) * 2</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(7/9) - (3/5)</gadget>
<output>8/45 = around 0.177778</output>

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

<result>360</result>