factory planned to produce a batch of parts in May, completed the plan in the first half of the month (July 12), completed 50 more parts in the second half than the first half, and actually produced 450 more parts than planned. How many parts do you plan to produce in May?
某工厂五月份计划生产一批零件，上半月完成了计划的(7/12)，下半月比上半月多完成了50个，结果实际比计划多生产了450个．五月份计划生产零件多少个？
<gadget id="calculator">450 - 50</gadget>
<output>400</output>

<gadget id="calculator">7 / 12</gadget>
<output>7/12 = around 0.583333</output>

<gadget id="calculator">(7/12) * 2</gadget>
<output>7/6 = around 1.166667</output>

<gadget id="calculator">(7/6) - 1</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">400 / (1/6)</gadget>
<output>2_400</output>

<result>2_400</result>