The average of 9 consecutive even natural numbers is 10. Next 3 consecutive even natural numbers to these 9 even natural numbers are also included. What is the sum of newly added numbers?
Show answer & explanation
Correct answer: D
Explanation
Given:
Average of 9 consecutive even numbers = 10
According to the formula:
Average of consecutive numbers = Middle number
Middle number = 10
Therefore, the 9 numbers are:
2, 4, 6, 8, 10, 12, 14, 16, 18
The next 3 even numbers are:
20, 22, 24
Sum = 20 + 22 + 24 = 66