AMC 8 2004 Problem 8
AMC8 2004 年第 8 题
基本计数原理★★☆☆☆
Problem Find the number of two-digit positive integers whose digits total 7.
求各个位上数字之和为 7 的两位正整数的个数。 Problem 9 The average of the five numbers in a list is the average of the last three numbers?. The average of the first two numbers is. What is 一列 5 个数的平均值为 54。已知前 2 个数的平均值为 48。则最后 3 个数的平均值是多少？
- A.6
- B.7
- C.8
- D.9
- E.10
正确答案 · Correct Answer
B
解析 · Solution
解析整理中
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