Question

Find the average of 12 numbers if the average of the first nine numbers is 21 and the average of the last three is 17

Answer 1

Answer:

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Answer 2

Answer:

Since the average of the first nine numbers is 21

So the sum of first 9 numbers = 21×9 = 189

Again the average of the last three is 17

So the sum of first 3 numbers = 17×3= 51

So the sum of 12 numbers = 189 + 51 = 240

So the required average = 240/12 = 20

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