3 workers process 90 parts in 2 hours, how many workers are needed to complete the processing of 1800 parts in 10 hours.
3名工人2小时加工零件90个，要在10小时完成1800个零件的加工，需要工人多少名．
<gadget id="calculator">90 / 2 / 3</gadget>
<output>15</output>

<gadget id="calculator">1_800 / 10 / 15</gadget>
<output>12</output>

<result>12</result>