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Director
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x | y | z | --------------- 4 | 1 |-5| m e | 7 | n | 10 f | [#permalink] New post 10 Mar 2008, 00:58
+ | 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 ?
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Re: Addition Table [#permalink] New post 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. :P :P :P
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Director
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Re: Addition Table [#permalink] New post 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. :P :P :P



Thanks. I went dumb when i saw this problem. :lol:
Director
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Re: Addition Table [#permalink] New post 10 Mar 2008, 02:58
GMATTIGER,

Could you explain this please,

I am lost :(
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Re: Addition Table [#permalink] New post 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 :(

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Director
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Re: Addition Table [#permalink] New post 11 Mar 2008, 02:06
Thank you, I understood :)
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Re: Addition Table   [#permalink] 11 Mar 2008, 02:06
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