and B process a batch of parts at the same time. When A completes (2/7) of the total number, B completes 16 parts; when B completes 24 parts, A completes 36 parts. How many parts are there in this batch?
甲乙两人同时加工一批零件，当甲完成总数的(2/7)时，乙完成16个零件；当乙完成24个零件时，甲完成36个零件，这批零件有多少个？
<gadget id="calculator">16 / 24</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">(2/3) / (2/7)</gadget>
<output>7/3 = around 2.333333</output>

<gadget id="calculator">36 * (7/3)</gadget>
<output>84</output>

<result>84</result>