There are 1,200 students in Xingguang Primary School. In this sports meeting, 720 boys and 460 girls participated in the competition. How many students did not participate in the competition?
星光小学有1200名学生，本次运动会中，有720名男生和460名女生参加了比赛，有多少名学生没有参加比赛？
<gadget id="calculator">720 + 460</gadget>
<output>1_180</output>

<gadget id="calculator">1_200 - 1_180</gadget>
<output>20</output>

<result>20</result>