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The average of ten numbers is 72. The av...

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 `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

77.5

D

77

Text Solution

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The correct Answer is:
D
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