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Re: The average of m, n and p is q and the average of q and r is s. Which
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26 Mar 2018, 06:48
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Bunuel wrote:
The average of m, n and p is q and the average of q and r is s. Which of the following is r, in terms of m, n, p and s?
A. (6s - m + n + p)/3
B. (6s - m - n - p)/3
C. (2s - m - n - p)/3
D. (s + m + n + p)/2
E. 2s - m + n + p
Another approach is the INPUT-OUTPUT approach.
First find some values of m, n, p, q, r and s that satisfy all of the given information.
For example, the following values satisfy all of the given information: m = 1, n = 1, p = 1, q = 1, r = 1 and s = 1 In other words, when m = 1, n = 1, p = 1, q = 1 and s = 1, the value of r is 1
QUESTION: Which of the following is r in terms of m, n, p and s? Since r = 1, we're looking for an answer choice that yields an OUTPUT of 1, when we INPUT m = 1, n = 1, p = 1, q = 1 and s = 1
A. (6s - m + n + p)/3 = (6 - 1 + 1 + 1)/3 = 7/3. No good - we need an OUTPUT of 1. ELIMINATE A.
B. (6s - m - n - p)/3 = (6 - 1 - 1 - 1)/3 = 1. Perfect. KEEP B.
C. (2s - m - n - p)/3 = (2 - 1 - 1 - 1)/3 = -1/3. No good - we need an OUTPUT of 1. ELIMINATE C.
D. (s + m + n + p)/2 = (1 + 1 + 1 + 1)/2 = 2. No good - we need an OUTPUT of 1. ELIMINATE D.
E. 2s - m + n + p = 2 - 1 + 1 + 1 = 3. No good - we need an OUTPUT of 1. ELIMINATE E.
Answer: B
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Re: The average of m, n and p is q and the average of q and r is s. Which &nbs
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26 Mar 2018, 06:48
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78% (01:32) correct 
