A certain factory has 420 female employees, 20% less than male employees. How many employees does this factory have?
某工厂有女职工420人，比男职工少20%，这个厂共有职工多少人？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">420 / (4/5)</gadget>
<output>525</output>

<gadget id="calculator">420 + 525</gadget>
<output>945</output>

<result>945</result>