Q: The average of eleven numbers is 68. The average of the first four numbers is 78 and that of the next four numbers is 63. The 9th number is two times the 11th number and the 10th number is 4 less than the 11th number. What is the average of the 9th and 11th numbers?
A.
72.6
B.
70.1
C.
72.2
D.
70.5
Correct Answer:
Option D -
Explanations:
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