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30 Jul 2012, 02:12
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E
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Difficulty:
15%
(low)
Question Stats:
81% (01:22) correct
19%
(01:16)
wrong
based on 2723
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A certain expressway has Exits J, K, L, and M, in that order. What is the road distance from Exit K to Exit L ?
(1) The road distance from Exit J to Exit L is 21 kilometers.
(2) The road distance from Exit K to Exit M is 26 kilometers.
(1) The road distance from Exit J to Exit L is 21 kilometers.
(2) The road distance from Exit K to Exit M is 26 kilometers.
03 Aug 2012, 05:36
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SOLUTION
A certain expressway has Exits J, K, L, and M, in that order. What is the road distance from Exit K to Exit L ? 
JKLM.png [ 1.32 KiB | Viewed 38232 times ]
(1) The road distance from Exit J to Exit L is 21 kilometers. JL=21, so JK+KL=21. Not sufficient.
(2) The road distance from Exit K to Exit M is 26 kilometers. KM=26, so KL+LM=26. Not sufficient.
(1)+(2) We have two distinct linear equations with three unknowns, hence we cannot solve for any of them. Not sufficient.
Answer: E.
A certain expressway has Exits J, K, L, and M, in that order. What is the road distance from Exit K to Exit L ?
Attachment:
JKLM.png [ 1.32 KiB | Viewed 38232 times ]
(2) The road distance from Exit K to Exit M is 26 kilometers. KM=26, so KL+LM=26. Not sufficient.
(1)+(2) We have two distinct linear equations with three unknowns, hence we cannot solve for any of them. Not sufficient.
Answer: E.
General Discussion
25 Nov 2012, 16:20
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J-K-L-M
We know the distance between J and L
We know the distance between K and M
Neither of these tells us anything about the distance between K and L -> A, B, D incorrect
The two statements put together allso tell us nothing about the distance between K and L -> C incorrect
E is correct
Look at this another way, taking a dash for 5 units, and approximating, you can diagram (I) and (II) together as:
J---K-L----M
OR
J--K--L---M
OR
J-K---L--M
Hence E
I don't have a simpler explanation, I'm afraid.
We know the distance between J and L
We know the distance between K and M
Neither of these tells us anything about the distance between K and L -> A, B, D incorrect
The two statements put together allso tell us nothing about the distance between K and L -> C incorrect
E is correct
Look at this another way, taking a dash for 5 units, and approximating, you can diagram (I) and (II) together as:
J---K-L----M
OR
J--K--L---M
OR
J-K---L--M
Hence E
I don't have a simpler explanation, I'm afraid.
