Girls in Zhongtian Elementary School account for 61% of the whole school. How many boys in this school account for the whole school?
中田小学女生占了全校的61%，该学校的男生占全校的多少
<gadget id="calculator">61 / 100</gadget>
<output>61/100 = around 0.61</output>

<gadget id="calculator">1 - (61/100)</gadget>
<output>39/100 = around 0.39</output>

<result>39/100 = around 0.39</result>