Distance between exits #13 DS OG11

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wolfe05: Newbie | Next Rank: 10 Posts; Posts: 5; Joined: Sat Apr 25, 2009 1:27 pm; Thanked: 1 times

Distance between exits #13 DS OG11

by wolfe05 » Mon Apr 27, 2009 5:01 pm

This one is from the OG.

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 J to L is 21 kilometers
2) The road distance from K to M is 26 kilometers

E

I don't understand why the answer isn't C.

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Source: Beat The GMAT — Data Sufficiency | Mon Apr 27, 2009 5:01 pm

dmateer25: Community Manager; Posts: 1049; Joined: Sun Apr 06, 2008 5:15 pm; Location: Pittsburgh, PA; Thanked: 113 times; Followed by:27 members; GMAT Score:710

by dmateer25 » Mon Apr 27, 2009 5:32 pm

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gdsurdy: Newbie | Next Rank: 10 Posts; Posts: 7; Joined: Sat Apr 18, 2009 8:58 am

by gdsurdy » Tue Apr 28, 2009 11:40 am

Let’s say JK = x, KL = y and LM = z.

To answer the question we need to find y.

Using 1: x + y = 21 cant calculate y.

Using 2: y + z = 26 cant calculate y.

Using both the statements together we still cant compute as we have three variables and only two equations.

G.D.