The number of female workers in a workshop is male (5/7). If the number of male workers is reduced by 18, it is exactly equal to the current number of workers in the whole workshop (11/21). How many female workers are there in this workshop?
一个车间女工是男工的(5/7)，男工人数如果减少18人，正好等于全车间现有人数的(11/21)，这个车间有女工多少人？
<gadget id="calculator">5 + 7</gadget>
<output>12</output>

<gadget id="calculator">12 / 5</gadget>
<output>12/5 = around 2.4</output>

<gadget id="calculator">11 / 21</gadget>
<output>11/21 = around 0.52381</output>

<gadget id="calculator">1 - (11/21)</gadget>
<output>10/21 = around 0.47619</output>

<gadget id="calculator">1 / (10/21)</gadget>
<output>21/10 = around 2.1</output>

<gadget id="calculator">(12/5) - (21/10)</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">18 / (3/10)</gadget>
<output>60</output>

<result>60</result>