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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?
5Q:
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?
- 176false
- 276.5false
- 377true
- 477.5false
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