There are 300 people in the school participating in the group gymnastics performance, of which the number of boys accounts for 30%, and how many girls are there?
学校有300人参加团体操表演，其中男生人数占30%，女生有多少人．
<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1 - (3/10)</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">300 * (7/10)</gadget>
<output>210</output>

<result>210</result>