In a certain speech contest, there were originally 10 first prizes and 20 second prizes. Now the last 4 of the first prizes are adjusted to the second prizes. In this way, the average score of the students who won the second prizes increased by one point. The average score of the students who won the first prize increased by 3 points, so how much more the average score of the original first prize is than the average score of the second prize.
某次演讲比赛，原定一等奖10人，二等奖20人，现将一等奖中的最后4人调整为二等奖，这样得二等奖的学生的平均分提高了一分，得一等奖的学生的平均分提高了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">6 * 3</gadget>
<output>18</output>

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

<gadget id="calculator">24 * 1</gadget>
<output>24</output>

<gadget id="calculator">18 + 24</gadget>
<output>42</output>

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

<gadget id="calculator">42 / 4</gadget>
<output>21/2 = around 10.5</output>

<result>21/2 = around 10.5</result>