10 students participate in a mathematics competition. The average score of the top 4 students is 150 points, and the average score of the last 6 students is 20 points less than the average score of the 10 students. What is the average score of these 10 students?
10名同学参加数学竞赛，前4名同学平均得分150分，后6名同学平均得分比10人的平均分少20分，这10名同学的平均分是多少分．
<gadget id="calculator">4 * 150</gadget>
<output>600</output>

<gadget id="calculator">6 * 20</gadget>
<output>120</output>

<gadget id="calculator">600 - 120</gadget>
<output>480</output>

<gadget id="calculator">10 - 6</gadget>
<output>4</output>

<gadget id="calculator">480 / 4</gadget>
<output>120</output>

<result>120</result>