Question
The average of 15 numbers is 118. The average of the
first 5 numbers is 92, and that of the next 7 numbers is 120. The 13th number is 14 more than the 14th number but 13 less than the 15th number. What is the average of the 13th and 15th numbers?Solution
The correct answer is C
The sum of three consecutive odd natural numbers each divisible by 3 is 81. Which number is the largest number among the three numbers?
What is the ratio of the sum of the squares of the first 8 natural numbers to the sum of the first 12 odd natural numbers?
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