After an organization is streamlined, there are 120 staff members, which is 30 fewer than the original staff. How much has been streamlined?
一个机关精简机构后有工作人员120人，比原来的工作人员少了30人，精简了多少．
<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>