The average of 7 numbers is 8. If a number is added to them, the average…
2024
The average of 7 numbers is 8. If a number is added to them, the average becomes 9. What is the number added accordingly?
Answer: C. 16 — Given: Average of 7 numbers = 8, so the total of the 7 numbers is 7 × 8 = 56. After adding one number, average of 8 numbers = 9, so the new total is 8 × 9 =…
- A.
12
- B.
11
- C.
16
- D.
14
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Correct answer: C
Given:
Average of 7 numbers = 8, so the total of the 7 numbers is 7 × 8 = 56.
After adding one number, average of 8 numbers = 9, so the new total is 8 × 9 = 72.
Added number = new total − original total = 72 − 56 = 16.
Therefore the added number is 16.
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