Boai Primary School held a mathematics competition. After ranking the results, the average score of the top five students was 1 point less than the average score of the top three students. The average score of the top seven is 2 points less than the average score of the top five. How much more is the sum of the scores of the fourth and fifth players than the sum of the scores of the sixth and seventh players?
博爱小学举行数学竞赛，把成绩排列名次后，前五名平均分比前三名平均分少1分．前七名平均分比前五名平均分少2分．问第四、五名两人得分之和比第六、七名两人得分之和多了几分？
<gadget id="calculator">7 - 1.5</gadget>
<output>5.5</output>

<gadget id="calculator">5.5 * 2</gadget>
<output>11</output>

<result>11</result>