Reading Time: < 1 minute
Last Updated on May 6, 2023
GMAT OFFICIAL GUIDE DS
Solution:
We are given that n + k = m, and we need to determine the value of k. Since we know that n + k = m, we know that k = m – n. Thus, if we determine a value for m – n, we will know the value of k.
Statement One Alone:
n = 10
Although we know that n = 10, without knowing the value of m, we cannot determine the value of k. Statement one alone is not sufficient. We can eliminate answer choices A and D.
Statement Two Alone:
m + 10 = n
Manipulating statement two we get:
m + 10 = n
m – n = -10
Since we know that m – n = -10, we know that k = -10. Statement two alone is sufficient.
Answer: B
