In a workshop, the number of male workers is twice that of female workers. 42 male workers were transferred to support the earthquake relief work. At this time, the ratio of male to female workers was 4:9. How many female workers are there in this workshop?
某车间男职工是女职工人数的2倍，因支援抗震救灾调走男职工42人，这时男女职工人数的比是4：9，这个车间有女职工多少人？
<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">2 - (4/9)</gadget>
<output>14/9 = around 1.555556</output>

<gadget id="calculator">42 / (14/9)</gadget>
<output>27</output>

<result>27</result>