A certain agency now has 90 staff members, which is 30 fewer than before. How much is the reduction?
某机关现在有工作人员90人，比原来精简了30人，精简了百分之几？
<gadget id="calculator">30 + 90</gadget>
<output>120</output>

<gadget id="calculator">30 / 120</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>