A certain factory has 240 employees, 55% of whom are female employees. Later, a group of female employees were transferred in. At that time, the ratio of female employees to the entire factory was 3:5. How many female employees were transferred later?
某厂有职工240人，其中女职工占55%，后来又调进一批女职工，这时女职工与全厂职工的人数比是3：5，后来又调进多少名女职工？
<gadget id="calculator">55 / 100</gadget>
<output>11/20 = around 0.55</output>

<gadget id="calculator">1 - (11/20)</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(9/20) / (2/5)</gadget>
<output>9/8 = around 1.125</output>

<gadget id="calculator">240 * (9/8)</gadget>
<output>270</output>

<gadget id="calculator">270 - 240</gadget>
<output>30</output>

<result>30</result>