The number of boys in a certain school accounts for 45% of the total number of students, the number of students who can swim accounts for 54% of the total number of students, and the number of boys who can swim accounts for 72%. Then, among all the students, how many girls can't swim?
某校男生人数占学生总数的45%，会游泳的学生占学生总数的54%，男生中会游泳的占72%，那么，在全体学生中，不会游泳的女生占多少．
<gadget id="calculator">45 / 100</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">1 - (9/20)</gadget>
<output>11/20 = around 0.55</output>

<gadget id="calculator">54 / 100</gadget>
<output>27/50 = around 0.54</output>

<gadget id="calculator">72 / 100</gadget>
<output>18/25 = around 0.72</output>

<gadget id="calculator">(9/20) * (18/25)</gadget>
<output>81/250 = around 0.324</output>

<gadget id="calculator">(27/50) - (81/250)</gadget>
<output>27/125 = around 0.216</output>

<gadget id="calculator">(11/20) - (27/125)</gadget>
<output>167/500 = around 0.334</output>

<result>167/500 = around 0.334</result>