There are 120 people in a certain organization, which is 30 fewer than before. How much is the reduction?
某机关现有120人，比原来精简了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>