There are three workshops in a certain factory, and the first workshop produces 600 machines per month, accounting for 30% of the monthly production of the whole factory. The monthly output of the second workshop is (1/4) of the monthly output of the whole factory. How many machines are the monthly output of the third workshop?
某厂共有三个车间，第一车间月产机器600台，正好占全厂月产量的30%．第二车间的月产量是全厂月产量的(1/4)，第三车间月产机器多少台？
<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">600 / (3/10)</gadget>
<output>2_000</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (3/10) - (1/4)</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">2_000 * (9/20)</gadget>
<output>900</output>

<result>900</result>