A factory has a total of 2000 employees. The ratio of male workers to female workers was 2:3, and later a group of female workers were recruited. At this time, the ratio of female workers to male workers was 2:1. How many female employees were recruited later?
某工厂有职工共2000人．男职工和女职工的人数比是2：3，后来又招了一批女职工，此时女职工和男职工的人数比是2：1．后来招了多少女职工？
<gadget id="calculator">1_600 - 1_200</gadget>
<output>400</output>

<result>400</result>