After the streamlining of an organization, there are 120 staff members, which is 30 fewer than the original staff. How much is the reduction?
一个机关精简后有工作人员120人，比原来人员少了30人，精简了百分之几？
<gadget id="calculator">120 + 30</gadget>
<output>150</output>

<gadget id="calculator">30 / 150</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>