There are 52 workers in a certain workshop, and 4 female workers were transferred later. At this time, the number of female workers is 3/4 of the number of male workers. How many female workers were there in this workshop?
某车间有52名工人，后来又调进4名女工人，这时女工人数是男工人数的(3/4)，这车间原有女工多少人？
<gadget id="calculator">52 + 4</gadget>
<output>56</output>

<gadget id="calculator">4 + 3</gadget>
<output>7</output>

<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">56 * (4/7)</gadget>
<output>32</output>

<gadget id="calculator">52 - 32</gadget>
<output>20</output>

<result>20</result>