选择题
2022 AMC 8 Problem 16: Four Number Averages
Four numbers are written in a row. The average of the first two is 21, the average of the middle two is 26, and the average of the last two is 30. What is the average of the first and last of the numbers?
2022 AMC 8 第 16 题：四次平均数
四个数字连续写入。前两个的平均值是 21，中间两个的平均值是 26，后两个的平均值是 30。第一个和最后一个数字的平均值是多少
A.
24
B.
25
C.
26
D.
27
E.
28