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PS help gmat prep Q attachment added

by Riggz » Sun Apr 27, 2008 9:58 am
question from gmat prep

+ X Y Z
4 1 -5 m
e 7 n 10
f 2 4 5

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

-19
4
5
6
22

please help with thsi..im sure answer is very simple but dont know how to do it...TIA
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Last edited by Riggz on Sun Apr 27, 2008 6:22 pm, edited 1 time in total.
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by freedsl » Sun Apr 27, 2008 12:13 pm
can you post the image or screen grap, its hard to follow your question!! tks
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by Riggz » Sun Apr 27, 2008 2:19 pm
sorry i am posting this from another computer than what I did the test on.

They columns and rows are supposed to be all lined up.

Ill try to post the screen shot asap
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by Sunny22uk » Sun Apr 27, 2008 7:41 pm
This question is simple but just requires a careful look. Here is the solution:-
1) The table is a chart for addition of two numbers e.g. x+4=1, y+4= -5
2) In this question ,we need to know m+n
3) We can rewrite m as z+4 and we can write n as e+y
4) that means m+n = z+4+e+y
5) Also, e+z= 10
6) Additionally ,y+4=-5, i.e y=-9
7) Substitute the value of e+z and y from steps 5 and 6 in step 4
8) Answer is 5
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