Bunuel
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