the average 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
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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.
The difference between the two sums obtained will be the number removed =120-75=45.
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