"Welcome to the 2008 Olympic Games and enhance physical fitness". A total of 750 students from Honggang Primary School participated in the long-distance running event. Among them, boys accounted for 3/5 of the total number of participants. How many girls are there?
"迎2008年奥运会，增强身体素质"，红港小学共有750名学生参加长跑活动，其中参加活动男生的人数占活动总人数的(3/5)，女生有多少人？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">750 * (2/5)</gadget>
<output>300</output>

<result>300</result>