There are 100 students from a certain school who participated in the preliminary competition of the National English Competition, and the average score is 55 points. 20 students were admitted to participate in the rematch. The average score of the students who participated in the rematch was 45 points higher than the average score of the students who did not participate in the rematch.
某学校有100名同学参加全国英语竞赛初赛，平均分是55分．录取了20名参加复赛，参加复赛的同学的平均分比没参加复赛的平均分多了45分，竞赛录取的分数比参加复赛的同学的平均分少了4分，竞赛录取分数是多少分．
<gadget id="calculator">80 * 45</gadget>
<output>3_600</output>

<gadget id="calculator">100 * 55</gadget>
<output>5_500</output>

<gadget id="calculator">20 * 4</gadget>
<output>80</output>

<gadget id="calculator">80 * 4</gadget>
<output>320</output>

<gadget id="calculator">5_500 - 80 - 320</gadget>
<output>5_100</output>

<gadget id="calculator">3_600 + 5_100</gadget>
<output>8_700</output>

<gadget id="calculator">20 + 80</gadget>
<output>100</output>

<gadget id="calculator">8_700 / 100</gadget>
<output>87</output>

<result>87</result>