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The average of eleven numbers is 80. The...

The average of eleven numbers is 80. The average of the first four members is 74.5 and that of the next four numbers is 82.5. The nineth number is 6 more than the tenth number, and the tenth number is 6 less than the eleventh number. What is the average of the nineth and eleventh numbers ?

A

87

B

80

C

86

D

85

Text Solution

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The correct Answer is:
C
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