A and B accept the same kind of parts and the same number of processing tasks at the same time. When A processes 7 pieces, B can only process 5 pieces. In the same time period, when A completes the processing task, B has 80 pieces left unprocessed. How many parts have been processed?
甲乙两人同时接受了同种零件，相同数量的加工任务，甲加工7个的时间乙只能加工5个，在相同时间内，当甲完成加工任务时，乙还剩80个没有加工，甲接收了多少个零件的加工任务？
<gadget id="calculator">5 / 7</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">1 - (5/7)</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">80 / (2/7)</gadget>
<output>280</output>

<result>280</result>