Question

the average of 20 consecutive natural numbers is 30.5 find the average of 10th and 11th natural numbers​

Answer 1

Answer:

12.5.

Step-by-step explanation:

Let the 5 consecutive numbers be: x-2, x-1, x, x+1 and x+2.

The sum of the 5 numbers is 5x and their average is 13. So x = 13.

The total of the 5 numbers is 5x13 = 65 and the last number is 15. So the sum the first four numbers is 65–15 = 50 and so the average of the first four numbers is 50/4 = 12.5.

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