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Stuck on this simple problem

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by gmatcrasher2010 » Wed May 19, 2010 7:14 pm
Members,
please help me to solve this problem. Its from GMAT Prep test.I am sure its a very simple problem, but somehow I am not able to solve this.
THanks
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by vineetbatra » Wed May 19, 2010 7:59 pm
I didn't find it simple man, but I would go with 6. M =8, N I couldnt figure, I guessed it should be closer to 0 but less. Between 5 and 6, I pick 5, but have no clue what is N.
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by anishsousa » Wed May 19, 2010 10:07 pm
Hi,

I think the answer should be m+n=5

It's a simple addition grid which gives equations as follows:
4+x=1 => x=-3
4+y=-5 => y=-9
e+x=7 => e=10
e+y=n => n =1
e+z=10 => z=0
and 4+z=m => m=4

=> m+n=4+1=5

You can cross check the logic on other addition combinations i.e. check if LHS=RHS

Thanks,
Anish
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by saurabhmahajan » Wed May 19, 2010 10:22 pm
I think Answer is 5.

Explanation:
x+4=1 therefore x=-3
x+e=7 therefore e=10
z+e=10 therefore z=0
z+4=m therefore m=4
y+4=-5 therefore y=-9
y+e=n therefore n= 1
and m+n=4+1=5

What is the OA?
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by vineetbatra » Thu May 20, 2010 4:56 am
Guys, can you please tell how did you know that 4+x=1, the way I was moving is 1 + -5 + m = 4. But you did a cross section addition.

My question is how did you know that you had to do a cross section addition and not the way I mentioned
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by Rahul@gurome » Thu May 20, 2010 5:07 am
vineetbatra wrote:Guys, can you please tell how did you know that 4+x=1, the way I was moving is 1 + -5 + m = 4. But you did a cross section addition.

My question is how did you know that you had to do a cross section addition and not the way I mentioned
In these type of questions, we look at the operator that is "+" in this case. Now, add the vertical value and the horizontal value as shown in the image. So, 4 + x = 1, 4 + y = -5, 4 + z = m and so on.

The correct answer is 5.

I hope that helps.
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by gmatcrasher2010 » Thu May 20, 2010 5:39 am
You guys are genius.
Yes the correct answer is 5.

But i dont understand what kind of concept we use here. I was trying to solve with Matrix to nowhere.

Once again, thank you all.
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