In a certain mathematics competition, (1/3) of the students passed the preliminary round. The average score of the students who passed the preliminary round was 6 points higher than the total average score. The average score of the students who failed the preliminary round was lower than the total average score by how much.
某次数学竞赛，有(1/3)的学生通过初赛，通过初赛的学生的平均分比总均分高6分，没有通过初赛的学生的平均分比总均分低多少分．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">30 * (1/3)</gadget>
<output>10</output>

<gadget id="calculator">30 - 10</gadget>
<output>20</output>

<gadget id="calculator">6 / 20</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">10 * (3/10)</gadget>
<output>3</output>

<result>3</result>