Xiaohong took the test six times last month. The average score of the third and fourth tests was 1 point higher than the average score of the first two tests, and 2 points lower than the average score of the last two tests. If the average score of the last three times is 3 points more than the average score of the first three times, then how much more is the fourth time than the third time.
小红上个月做了六次测验，第三、四次的平均分比前两次的平均分多1分，比后两次的平均分少2分．如果后三次平均分比前三次的平均分多3分，那么第四次比第三次多得多少分．
<gadget id="calculator">3 * 3</gadget>
<output>9</output>

<gadget id="calculator">9 - 6</gadget>
<output>3</output>

<result>3</result>