Five referees score a diver. If the highest score is removed, the average score will be 9 points; if the lowest score is removed, the average score will be 10 points. What is the difference between the highest score and the lowest score?
五名裁判员给一名跳水运动员打分，如果去掉一个最高分，平均得分9分；如果去掉一个最低分，平均得分10分．最高分和最低分相差几分？
<gadget id="calculator">10 * 4</gadget>
<output>40</output>

<gadget id="calculator">9 * 4</gadget>
<output>36</output>

<gadget id="calculator">40 - 36</gadget>
<output>4</output>

<result>4</result>