powerprep question..help ..its irritating me

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coolio: Newbie | Next Rank: 10 Posts; Posts: 5; Joined: Mon Sep 17, 2007 5:18 am

by coolio » Tue Mar 04, 2008 10:42 am

+ x y z
4 1 -5 M
E 7 N 10
f 2 -4 5

in the given addition table above what is the value of m+n?

19

4

5

10

22

pl help?

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Source: Beat The GMAT — Problem Solving | Tue Mar 04, 2008 10:42 am

Stuart@KaplanGMAT: GMAT Instructor; Posts: 3225; Joined: Tue Jan 08, 2008 2:40 pmFollowed by: 614 members; Location: Toronto; Thanked: 1710 times; GMAT Score:800

by Stuart@KaplanGMAT » Tue Mar 04, 2008 1:28 pm

Since we want the value of m + n, let's see what equations we can come up with.

m = z + 4

n = e + y

And if we add them together, we get:

m + n = z + 4 + e + y

Well, so far we don't have enough information - we need to find values for e, y and z.

So, let's grab some more equations:

4 + y = -5 (so y = -9)

e + z = 10

Great! Let's just rearrange our equation to:

m + n = y + (e + z) + 4

and now we just sub in:

m + n = -9 + (10) + 4

m + n = 5

Stuart Kovinsky | Kaplan GMAT Faculty | Toronto

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