The ratio of the number of boys and girls participating in group gymnastics performances is 40:100, and the number of boys participating in group gymnastics performances is equal to the number of girls.
参加团体操表演的男生与女生人数的比是40：100，团体操表演的男生相当于女生的多少．
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<result>2/5 = around 0.4</result>