There are 1,200 students in a certain school, 65% of whom are girls. How many boys are there?
某校有学生1200人，女生占65%，男生有多少人？
<gadget id="calculator">65 / 100</gadget>
<output>13/20 = around 0.65</output>

<gadget id="calculator">1 - (13/20)</gadget>
<output>7/20 = around 0.35</output>

<gadget id="calculator">1_200 * (7/20)</gadget>
<output>420</output>

<result>420</result>