The tractor factory plans to produce 3,600 tractors, and it has already produced (1/4). How many tractors have been produced?
拖拉机厂计划生产拖拉机3600台，已经生产了(1/4)，生产了多少台？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">3_600 * (1/4)</gadget>
<output>900</output>

<result>900</result>