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The average of five numbers is 7. If three new numbers would be added, then the new average comes out to be 8.5. What is the average of those three new numbers?
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- 9
- 10.5
- 11
- 11.5
- 9
Correct Option: C
Here , The average of five numbers = 7
Sum of five numbers = 7 × 5
If three new numbers would be added, then
The average of 8 numbers = 8.5
Sum of 8 numbers = 8.5 × 8
Sum of three new numbers = 8 × 8.5 – 7 × 5 = 68 – 35 = 33
| ∴ Required average = | = 11 | |
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