There are 4 numbers A, B, C, and D, one number is removed each time, and the average of the remaining 3 numbers is calculated 4 times in this way, and the following 4 numbers are obtained: 23, 26, 30, 33, A, B, C , What is the average number of D4 numbers.
A、B、C、D4个数，每次去掉一个数，将其余3个数求平均数，这样计算了4次，得到下面4个数：23，26，30，33，A、B、C、D4个数的平均数是多少．
<gadget id="calculator">23 + 26 + 30 + 33</gadget>
<output>112</output>

<gadget id="calculator">112 / 4</gadget>
<output>28</output>

<result>28</result>