The total value of the three batches of goods is 2250 yuan. According to quality, the ratio between the first batch and the second batch is 1:2, and the ratio between the second batch and the third batch is 1:2.5; The ratio of the batch to the third batch is 7:3. How much is the value of the first batch of goods?
三批货物共值2250元．按质量，第一批和第二批的比是1：2，第二批和第三批的比是1：2.5；按单价，第一批和第二批的比是3：1，第二批和第三批的比是7：3．则第一批货物值多少元．
<gadget id="calculator">1 * 3 * 7</gadget>
<output>21</output>

<gadget id="calculator">1 * 2 * 1 * 7</gadget>
<output>14</output>

<gadget id="calculator">2.5 * 1 * 2 * 3</gadget>
<output>15</output>

<gadget id="calculator">21 + 14 + 15</gadget>
<output>50</output>

<gadget id="calculator">7 / 50</gadget>
<output>7/50 = around 0.14</output>

<gadget id="calculator">1 * 3 * (7/50)</gadget>
<output>21/50 = around 0.42</output>

<gadget id="calculator">2_250 * (21/50)</gadget>
<output>945</output>

<result>945</result>