Addition Problem (GPREP)

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zagcollins: Master | Next Rank: 500 Posts; Posts: 167; Joined: Wed Jun 11, 2008 10:58 pm; Thanked: 2 times; Followed by:1 members

Addition Problem (GPREP)

by zagcollins » Wed Jul 30, 2008 9:50 pm

+ x y z
4 1-5 m
e 7 n 10
f 2 4 5

In this addition table, what is the value of m+n?

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Source: Beat The GMAT — Problem Solving | Wed Jul 30, 2008 9:50 pm

vishubn: Legendary Member; Posts: 574; Joined: Sun Jun 01, 2008 8:48 am; Location: Bangalore; Thanked: 28 times

by vishubn » Thu Jul 31, 2008 1:02 am

FYI

this is nbeen answered number of times in the preivuos post ! I request you to serach on the queetion

And headt start

this is a addition table ! first row first column add and solve for the unknown variables

U should get it ! if i am not wrong ! the answr is 5 ! if u can find i wil mre than happ to explaian !

Cheersa
vishu

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sudhir3127: Legendary Member; Posts: 829; Joined: Mon Jul 07, 2008 10:09 pm; Location: INDIA; Thanked: 84 times; Followed by:3 members

by sudhir3127 » Thu Jul 31, 2008 1:06 am

Answer is 10. Please search the forum before posting a new thread...

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zagcollins: Master | Next Rank: 500 Posts; Posts: 167; Joined: Wed Jun 11, 2008 10:58 pm; Thanked: 2 times; Followed by:1 members

by zagcollins » Thu Jul 31, 2008 7:21 am

further explanation necessary

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pepeprepa: Legendary Member; Posts: 661; Joined: Tue Jul 08, 2008 12:58 pm; Location: France; Thanked: 48 times

by pepeprepa » Thu Jul 31, 2008 8:54 am

Just correct it, it is not 4 but -4
Here is the link:
https://www.beatthegmat.com/addition-tab ... ight=table

First we can write 9 equations from this table (better not to do it during the test). You have 9 equations and 7 unknows so it's good.
1=x+4
-5=y+4
m=z+4
7=x+e
n=y+e
10=z+e
2=x+f
4=y+f
5=z+f

You look for
m+n=z+4+y+e

You directly have
x=-3
y=-9
7=x+e --> 7=-3+e --> e=10
n=y+e --> n=-9+10 -->n=1
10=z+e --> 10=z+10 --> z=0
m=z+4 --> m=4

So m+n=5

Good luck for your test tomorrow zag, trust you

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sudhir3127: Legendary Member; Posts: 829; Joined: Mon Jul 07, 2008 10:09 pm; Location: INDIA; Thanked: 84 times; Followed by:3 members

by sudhir3127 » Thu Jul 31, 2008 8:58 am

All the best Zag.... wish u all the good luck ,.., i am sure u will do well...

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VP_RedSoxFan: GMAT Instructor; Posts: 85; Joined: Thu May 01, 2008 12:56 pm; Location: Salt Lake City, UT; Thanked: 24 times; GMAT Score:750+