The average of ten numbers is 72. The average of the first four numbers is 69 and that of the next three number 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?

The average of ten numbers is 72. The average of the first four number

1.	The average of ten numbers is 72. The average of the first four numbers is 69 and that of the next three number is 74. The 8^th number is 6 more than the 9^th number and 12 more than the 10^th number. What is the average of the 8^th and 9^th numbers?
A.	76
B.	76.5
C.	77
D.	77.5
Answer» D. 77.5

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The average of ten numbers is 72. The average of the first four numbers is 69 and that of the next three number 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?

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