There were 400 staff members in a certain agency, and 220 staff members after streamlining the organization. How much has been streamlined?
某机关原有工作人员400人，精简机构后工作人员220人，精简了多少
<gadget id="calculator">400 - 220</gadget>
<output>180</output>

<gadget id="calculator">180 / 400</gadget>
<output>9/20 = around 0.45</output>

<result>9/20 = around 0.45</result>