The mathematics competition originally scheduled 10 first prizes and 20 second prizes. Now the last 4 people in the first prize are adjusted to the second prize, so that the average score of the second prize students is increased by 1.5 points, and the average score of the first prize students is increased by 3 points. So how much more is the average score of the first prize than the average score of the second prize?
数学竞赛原定一等奖10人，二等奖20人．现在将一等奖中最后4人调整为二等奖，这样使二等奖的学生的平均分提高了1.5分，使一等奖的学生平均分提高了3分．那么原来一等奖平均分比二等奖平均分多多少分．
<gadget id="calculator">10 - 4</gadget>
<output>6</output>

<gadget id="calculator">6 * 3</gadget>
<output>18</output>

<gadget id="calculator">20 + 4</gadget>
<output>24</output>

<gadget id="calculator">24 * 1.5</gadget>
<output>36</output>

<gadget id="calculator">18 + 36</gadget>
<output>54</output>

<gadget id="calculator">54 / 4</gadget>
<output>27/2 = around 13.5</output>

<result>27/2 = around 13.5</result>