Question

The average of ten numbers is 72. The average of the first four numbers is 69 and that of the next three numbers is 74. The 8th number is 6 more than the 9th number and 12 more than the 10th number. What is the average of the 8th and 9th numbers?

• A. 76
• B. 77.5
• C. 76.5
• D. 77

Answer 1

Answer: (D)