The number of girls who participated in the competition was 15 fewer than the boys. The result of the competition: all girls won prizes, and only (3/4) boys won. The number of prizes for men and women is equal. How many girls participated in the competition?
参加比赛的女生比男生少15人，比赛结果：女生全部获奖，男生只有(3/4)获奖，男女获奖人数相等，参加比赛的女生有多少人？
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 - (3/4)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">15 / (1/4)</gadget>
<output>60</output>

<gadget id="calculator">60 * (3/4)</gadget>
<output>45</output>

<result>45</result>