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# x | y | z | --------------- 4 | 1 |-5| m e | 7 | n | 10 f |

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Director
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x | y | z | --------------- 4 | 1 |-5| m e | 7 | n | 10 f | [#permalink]

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10 Mar 2008, 00:58
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

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

What is the value of m+n?

Is it like this?

-5 + 1 + m = 4 so m = 8
f = 2 -4 + 5 = 3

****since f = 3 , e = 2?****

then n = -15

so m+n = 7 ?
SVP
Joined: 29 Aug 2007
Posts: 2476
Followers: 70

Kudos [?]: 774 [0], given: 19

Re: Addition Table [#permalink]

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10 Mar 2008, 01:09
alpha_plus_gamma wrote:
+ | x | y | z |
---------------
4 | 1 |-5| m
e | 7 | n | 10
f | 2 |-4 | 5

What is the value of m+n?

Is it like this?

-5 + 1 + m = 4 so m = 8
f = 2 -4 + 5 = 3

****since f = 3 , e = 2?****

then n = -15

so m+n = 7 ?

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

lets rearrange:
m + n = (z + e) + (4 + y)
m + n = 10 + (-5) because (z+e) should be equal to 10 and (4+y) = -5.
therefore, (m + n) = 5

i guess i also did it many times.
_________________

Verbal: http://gmatclub.com/forum/new-to-the-verbal-forum-please-read-this-first-77546.html
Math: http://gmatclub.com/forum/new-to-the-math-forum-please-read-this-first-77764.html
Gmat: http://gmatclub.com/forum/everything-you-need-to-prepare-for-the-gmat-revised-77983.html

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Director
Joined: 14 Aug 2007
Posts: 729
Followers: 10

Kudos [?]: 196 [0], given: 0

Re: Addition Table [#permalink]

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10 Mar 2008, 01:25
GMAT TIGER wrote:
alpha_plus_gamma wrote:
+ | x | y | z |
---------------
4 | 1 |-5| m
e | 7 | n | 10
f | 2 |-4 | 5

What is the value of m+n?

Is it like this?

-5 + 1 + m = 4 so m = 8
f = 2 -4 + 5 = 3

****since f = 3 , e = 2?****

then n = -15

so m+n = 7 ?

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

lets rearrange:
m + n = (z + e) + (4 + y)
m + n = 10 + (-5) because (z+e) should be equal to 10 and (4+y) = -5.
therefore, (m + n) = 5

i guess i also did it many times.

Thanks. I went dumb when i saw this problem.
Director
Joined: 05 Jan 2008
Posts: 690
Followers: 5

Kudos [?]: 472 [0], given: 0

Re: Addition Table [#permalink]

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10 Mar 2008, 02:58
GMATTIGER,

Could you explain this please,

I am lost
_________________

Persistence+Patience+Persistence+Patience=G...O...A...L

SVP
Joined: 29 Aug 2007
Posts: 2476
Followers: 70

Kudos [?]: 774 [0], given: 19

Re: Addition Table [#permalink]

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10 Mar 2008, 22:48
alpha_plus_gamma wrote:
+ | x | y | z |
---------------
4 | 1 |-5| m
e | 7 | n | 10
f | 2 |-4 | 5

What is the value of m+n?

the positive sign, +, in the upper left tells that every entry in the box equal to sum of the corresponding element in the top row and first column.

so m = corresponding element in the top row (i.e. z) + corresponding element in the first column (i.e. 4) = z + 4
similarly n = y + e
so, m+n = y + e + z + 4
m+n = y + e + z + 4
lets try what value fits if we combine any two of the right hand side of the equation.

e + z = 10
y + 4 = -5

so lets sum them.
m+n = 10-5 = 5

did i make it clear?

prasannar wrote:
GMATTIGER,

Could you explain this please,

I am lost

_________________

Verbal: http://gmatclub.com/forum/new-to-the-verbal-forum-please-read-this-first-77546.html
Math: http://gmatclub.com/forum/new-to-the-math-forum-please-read-this-first-77764.html
Gmat: http://gmatclub.com/forum/everything-you-need-to-prepare-for-the-gmat-revised-77983.html

GT

Director
Joined: 05 Jan 2008
Posts: 690
Followers: 5

Kudos [?]: 472 [0], given: 0

Re: Addition Table [#permalink]

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11 Mar 2008, 02:06
Thank you, I understood
_________________

Persistence+Patience+Persistence+Patience=G...O...A...L

Re: Addition Table   [#permalink] 11 Mar 2008, 02:06
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