What will be the other number if mean of two numbers is M and one number is N.
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Let the numbers be a and n. Then
(a+n)/2 = m, or
a + n = 2m. Hence the other number is a or (2m-n).
Check: Average of (2m-n) and n = [2m-n+n]/2 = 2m/2 = m. Correct.
The other number is (2m-n).
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