The number of parts produced by workshop 1 in the first ten days of a month is 45% of the full month plan, and the number of parts produced in the middle ten days is the first ten days (2/9). The workshop completed the whole month plan on time in the second ten days of the month. Now we know that 7,000 more parts will be produced in the second half of the year than in the middle, how many parts are planned to be produced in the whole month?
一车间某月上旬生产的零件个数是全月计划的45%，中旬生产的零件数是上旬的(2/9)，该车间在下旬将全月计划按时完成了．现在知道下旬比中旬多生产7000个零件，求全月计划生产多少个零件？
<gadget id="calculator">45 / 100</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">2 / 9</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">(9/20) * (2/9)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">(9/20) + (1/10)</gadget>
<output>11/20 = around 0.55</output>

<gadget id="calculator">1 - (11/20) - (1/10)</gadget>
<output>7/20 = around 0.35</output>

<gadget id="calculator">7_000 / (7/20)</gadget>
<output>20_000</output>

<result>20_000</result>