To process a batch of parts, the time ratio of A and B alone is 3:5. The two now cooperate, and when the project is completed, A has completed (3/7) another 66 parts of this batch. How many parts are in this batch?
加工一批零件，单独做甲、乙两人所用的时间比是3：5．现两人合作，完工时甲完成了这批零件的(3/7)又66个．这批零件共多少个？
<gadget id="calculator">5 / 8</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">(5/8) - (3/7)</gadget>
<output>11/56 = around 0.196429</output>

<gadget id="calculator">66 / (11/56)</gadget>
<output>336</output>

<result>336</result>