workshop needs to process a batch of parts. If 28 parts are processed per hour, it can be completed 10 hours earlier than the original plan. If 20 parts are processed per hour, it can be completed 6 hours earlier than the original plan. How many parts are in this batch?
某车间要加工一批零件，如果每小时加工零件28个，可以比原计划提前10小时完成．如果每小时加工零件20个，可以比原计划提前6小时完成．这批零件有多少？
<gadget id="calculator">28 * 10</gadget>
<output>280</output>

<gadget id="calculator">20 * 6</gadget>
<output>120</output>

<gadget id="calculator">280 - 120</gadget>
<output>160</output>

<gadget id="calculator">28 - 20</gadget>
<output>8</output>

<gadget id="calculator">160 / 8</gadget>
<output>20</output>

<gadget id="calculator">20 - 6</gadget>
<output>14</output>

<gadget id="calculator">20 * 14</gadget>
<output>280</output>

<result>280</result>