and B jointly produce a batch of parts, A completes (3/7) of the total task, and the rest is completed by B, B produces 12 more parts than A, how many parts does B make?
甲、乙两人共同生产一批零件，甲完成总任务的(3/7)，其余的由乙完成，乙比甲多生产12个零件，乙做了多少个零件？
<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">1 - (3/7) - (3/7)</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">12 / (1/7)</gadget>
<output>84</output>

<gadget id="calculator">1 - (3/7)</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">84 * (4/7)</gadget>
<output>48</output>

<result>48</result>