The number of male workers in a workshop is twice the number of female workers. If 18 male workers are transferred, the number of female workers is twice the number of male workers. How many female workers are there in this workshop?
某车间男工人数是女工人数的2倍，若调走18个男工，那么女工人数是男工人数的2倍，这个车间的女工有多少人？
<gadget id="calculator">18 * 2</gadget>
<output>36</output>

<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">4 - 1</gadget>
<output>3</output>

<gadget id="calculator">36 / 3</gadget>
<output>12</output>

<result>12</result>