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| 1. |
The average of thirteen numbers is 80. The average of the first five numbers is 74.5 and that of the next five numbers is 82.5. The 11th numbers is 6 more than the 12th number and the 12th number is 6 less than the 13th number. What is the average of the 11th and the 13th numbers? |
| A. | 87 |
| B. | 87.5 |
| C. | 86 |
| D. | 86.5 |
| Answer» B. 87.5 | |