AMC 8 1988 Problem 18

AMC8 1988 年第 18 题

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The average weight of 6 boys is 150 pounds and the average weight of 4 girls is 120 pounds. The average weight of the 10 children is

6 个男孩的平均体重是 150 磅，4 个女孩的平均体重是 120 磅。这 10 个孩子的平均体重是

A. $135\text{ pounds}$ / 135 磅
B. $137\text{ pounds}$ / 137 磅
C. $138\text{ pounds}$ / 138 磅
D. $140\text{ pounds}$ / 140 磅
E. $141\text{ pounds}$ / 141 磅

正确答案 · Correct Answer

解析 · Solution

Solution 1

The total weight of the boys is 6×150 = 900 pounds, and the total weight of the girls is 4×120 = 480 pounds. Therefore, the total weight of all 10 children is 900 + 480 = 1380 pounds, and their average weight is

1380 \div 10 = 138

pounds.

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