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GMAT PREP PS - MISCELLANEOUS

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by rveeraga » Mon Nov 23, 2009 10:25 pm
+ | x y z
4 | 1 -5 m
e | 7 n 10
f | 2 -4 5

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

a. -19
b. 4
c. 5
d. 6
e. 22

anwer is c. 5

can some one wants to take a shot at it?

thanks.
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by bigmikefr » Wed Nov 25, 2009 8:25 pm
I guess we're just looking for patterns in the operations. If it's a table, it must be that each number 4, e, & f is added to x, y, and z, individually. If you look at the first row, you will see that 4+x= 1and 4+y=-5. This simply means that x and y are equal to -3 and -9, respectively. But we still need m and we assume that the other rows follow the same patterns. So for row e, 7 is the result of e+(-3); therefore e must equal 10, right? On the same row, we notice that 10+z=10, then z =0. There for 4+0=4. The table ends up looking like this:

+ |-3 -9 0
4 | 1 -5 4
10 | 7 1 10
5 | 2 -4 5

m+n=4+1=5

Hopefully this helps
Last edited by bigmikefr on Thu Nov 26, 2009 7:40 am, edited 2 times in total.
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by thephoenix » Thu Nov 26, 2009 2:27 am
check attachement for solution
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solution.xls
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by rveeraga » Thu Nov 26, 2009 10:58 pm
It is great explanation. Thank you
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