The average of two numbers is K. If one number is equal to M, the other number is equal to?

Question

I've been through this problem a lot of times and always ends up with the same answer. Since the average is K, the sum of the two numbers is 2K. Since one number is M, the other number is 2K - M. I guess the best answer to this question will have to be decided by a vote. Thanks everyone.

Answer 1

m+2k or m-2k

Answer 2

Suppose we have two numbers, M and N

Let K be the average of M and N.

So K = (M+N)/2
K = M/2 + N/2
K - M/2 = N/2

N/2 = K - M/2
N = 2(K - M/2)
N = 2K - M

Answer 3

if the other number is x,
x=2k-m
simple (m+x)/2=k

Answer 4

let X be the other number. then X + M = 2K, so X = 2K - M

which is your answer: 2K - M

Answer 5

2K-M
http://www.freewebs.com/eclecticstuff

WHAT A MESS, I better explain!
The average of TWO numbers is the TWO NUMBERS ADDED TOGETHER DIVIDED 2.
SO, One Number is M, let us call the other X
(X+M)/2=K
x+M=2K
x=2K-M

Answer 6

Let x be the unknown.
So, (x+M)/2=K as K is the average.
x+M=2K
x=2K-M
Hence second number = 2K-M

Answer 7

let us assume the unknown no. to be = x
the other no. is =M
now,
average is the sum of the no.'s divided by the No. of number's.
so,
(M+x)/2=K
M+x=2K
x=2K-M THIS IS THE ANS.

Answer 8

Theoritical answer is given by the answerers before me that the answer is 2K - M.
But practical answer is I (the 9th alphabet).
It is so simple that K is the middle letter between I and M if you write them in a line.
How is this answer?

Answer 9

Consider the two numbers are m and n

Then .....>>>> (m+n)/2 = k

-------> n = 2k-m

The other number is 2k-m

Answer 10

I think that it would be L.Could be anything really.But here's why I think it is L. Given that K is the average and M is one of the numbers a possible formula could be K= (L+M) / 2.
good luck.