The average of 12 numbers is 75. The average of the first 5 numbers is 68. The average of the next 5 numbers is 20% more than the average of the first 5 numbers. The 11th number is 12 more than the 12th number. What is the average of the 11th and 12th numbers?

उत्तर देखें और व्याख्या

उत्तर: (B) 76

व्याख्या

Total 900. First 5 sum to 340 and the next 5 (average 81.6) sum to 408, leaving 152 for the last two, whose average is 76.