Question

The average (arithmetic mean) of a list of 6 numbers is 20. If we remove one of the numbers, the average of the remaining numbers is 15. What is the number that was removed?

Answer 1

• answer: i dont know

Step-by-step explanation:

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Answer 2

Step-by-step explanation:

Solution: in the first context, average = 20 and number of items are 6. Hence the required sum = average x number of times = 20 x 6 = 120. Similarly, when one number is removed, required sum will be 15 x 5 = 75.

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