For the four numbers A, B, C, and D, one number is removed each time, and the average of the remaining three numbers is calculated, and the following four numbers are obtained after four calculations: 23, 26, 30, 33. What is the average of the four numbers A, B, C, and D?
A、B、C、D四个数，每次去掉一个数，将其余三个数求平均数，这样计算了四次，得到下面四个数：23，26，30，33．A、B、C、D四个数的平均数是多少
<gadget id="calculator">23 * 3</gadget>
<output>69</output>

<gadget id="calculator">26 * 3</gadget>
<output>78</output>

<gadget id="calculator">30 * 3</gadget>
<output>90</output>

<gadget id="calculator">33 * 3</gadget>
<output>99</output>

<gadget id="calculator">69 + 78 + 90 + 99</gadget>
<output>336</output>

<gadget id="calculator">336 / 3</gadget>
<output>112</output>

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

<result>28</result>