30 students from Class 4, Class 1 of Love Primary School held a rope skipping competition. Among them, the average number of rope skipping by 12 students was 85 times, and the average number of rope skipping times by the rest of the students was 90 times. May I ask how many times each classmate jumps on average?
爱心小学四1班30名同学举行跳绳比赛，其中有12名同学跳绳个数的平均数是85下，其余同学跳绳个数的平均数是90下．请问全班同学平均每人跳多少下？
<gadget id="calculator">85 * 12</gadget>
<output>1_020</output>

<gadget id="calculator">30 - 12</gadget>
<output>18</output>

<gadget id="calculator">90 * 18</gadget>
<output>1_620</output>

<gadget id="calculator">1_020 + 1_620</gadget>
<output>2_640</output>

<gadget id="calculator">2_640 / 30</gadget>
<output>88</output>

<result>88</result>