factory has 500 employees, of which 45% are male employees. How many female employees are there?
某工厂有职工500人，其中男职工占45%，女职工有多少人？
<gadget id="calculator">45 / 100</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">1 - (9/20)</gadget>
<output>11/20 = around 0.55</output>

<gadget id="calculator">500 * (11/20)</gadget>
<output>275</output>

<result>275</result>