Mathematics, 03.05.2021 14:00, uaodiase

The average of 6 numbers is 15. The average decreases by 1 when the 7th number is added. What is the value of the 7th number?

A. 7 C. 9

B. 8 D. 10

Answers: 3

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The average of 6 numbers is 15. The average decreases by 1 when the 7th number is added. What is t...