marcodonzelli wrote:
The figure above shows two entries, indicated by m and n, in an addition table. What is the value of n + m?
(1) d + y = -3
(2) e + z = 12
Target question: What is the value of n + m?Notice that the table tells us that m = d + z and that n = e + y
So, m + n = (d + z) + (e + y)
So we can REPHRASE the target question...
REPHRASED target question: What is the value of d + z + e + y? Statement 1: d + y = -3 This information provides only half of the information we need.
We still need the values of z and e in order to find the sum of d + z + e + y
Since we cannot answer the
REPHRASED target question with certainty, statement 1 is NOT SUFFICIENT
Statement 2: e + z = 12 This information provides only half of the information we need.
We still need the values of d and y in order to find the sum of d + z + e + y
Since we cannot answer the
REPHRASED target question with certainty, statement 2 is NOT SUFFICIENT
Statements 1 and 2 combined Statement 1 tells us that d + y = -3
Statement 2 tells us that e + z = 12
So,
d + z + e + y = (d + y) + (e + z) = (-3) + (12) = 9Since we can answer the
REPHRASED target question with certainty, the combined statements are SUFFICIENT
Answer:
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