Engineering team A has 600 people, of which 5% are old workers; engineering team B has 400 people, and old workers account for 20%. In order to make the percentages of old workers in both teams A and B the same, how many old workers in team B should be transferred one-on-one with young workers in team A?
甲工程队有600人，其中老工人占5%；乙工程队有400人，老工人占20%．要使甲、乙两队中老工人所占的百分比相同，应在乙队中抽调多少名老工人与甲队中的年轻工人进行一对一的对换？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">400 * (1/5)</gadget>
<output>80</output>

<gadget id="calculator">5 / 100</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">600 * (1/20)</gadget>
<output>30</output>

<gadget id="calculator">80 + 30</gadget>
<output>110</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">110 * (2/5)</gadget>
<output>44</output>

<gadget id="calculator">80 - 44</gadget>
<output>36</output>

<result>36</result>