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  3. The average of a set of six integers is 3When a seventh number is included in the set, the average of the set increases to 4What

The average of a set of six integers is 3When a seventh number is included in the set, the average of the set increases to 4What

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问题 The average of a set of six integers is 3When a seventh number is included in the set, the average of the set increases to 4What is the seventh number?
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答案101
解析 The correct answer is 101. If the average of the six integers is 38, then the total must be 6x38 = 228. If the average of the seven integers is 47, then the total must be 7x47 = 329. You are adding the seventh integer to the set, so the value of the seventh integer will be 329-228 = 101.
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