Last Updated on May 5, 2023
GMAT OFFICIAL GUIDE DS
Solution:
Let’s first put the given information into a diagram. We can also define variables for the distances between J and K, K and L, and L and M.
Distance from J to K = x
Distance from K to L = y
Distance from L to M = z
We are asked to determine the road distance from Exit K to Exit L. Thus, we need to determine the value of y.
Statement One Alone:
The road distance from Exit J to Exit L is 21 kilometers.
Statement one tells us that x + y = 21.
This is not enough information to answer the question. Statement one alone is not sufficient. Eliminate answer choices A and D.
Statement Two Alone:
The road distance from Exit K to Exit M is 26 kilometers.
Statement two tells us that y + z = 26.
This is not enough information to answer the question. Statement two alone is not sufficient. Eliminate answer choice B.
Statements One and Two Together:
From statements one and two we know the following:
x + y = 21 and y + z = 26
Since this is not enough to determine the value of y, we cannot answer the question.
Answer: E
