A certain factory originally had 500 workers, of which female workers accounted for (2/5). This year, a group of female workers were recruited. At this time, the number of female workers accounted for (2/3) of the total number of workers in the factory. How many female workers were recruited this year?
某工厂原有工人500人，其中女工占(2/5)，今年又招进一批女工，这时女工人数占全厂工人数的(2/3)，今年招进女工多少人？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">500 * (2/5)</gadget>
<output>200</output>

<gadget id="calculator">500 - 200</gadget>
<output>300</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 - (2/3)</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">300 / (1/3)</gadget>
<output>900</output>

<gadget id="calculator">900 - 300</gadget>
<output>600</output>

<gadget id="calculator">600 - 200</gadget>
<output>400</output>

<result>400</result>