The number of female workers in a workshop is (1/2) the number of male workers, if 21 male workers are transferred, the number of male workers is (1/2) the number of female workers. How many people were there in this workshop?
某车间的女工人数是男工人数的(1/2)，若调走21个男工，则男工人数是女工人数的(1/2)．这个车间原来共有多少人？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">2 - (1/2)</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">21 / (3/2)</gadget>
<output>14</output>

<gadget id="calculator">14 / (1/2)</gadget>
<output>28</output>

<gadget id="calculator">28 + 14</gadget>
<output>42</output>

<result>42</result>