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Addition Table

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Addition Table

by tinmn8 » Tue Oct 20, 2009 7:05 am
This is obviously easy because it was my second question on a GMAT prep test, but to me the chart is not self explanatory. Can someone explain? Answer is C

3) What is m+n?
a. 3
b. 4
c. 5
d. 6
e. 7

+ x y z
4 1 -5 m
e 7 n 10
f 2 -4 5
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by NikolayZ » Tue Oct 20, 2009 9:38 am
Hi there.
You should figure out that there is specific dependence among all members of the table.

Look at the last line of the table
f 2 -4 5, so it is (2-6+9), so n=7-6=1, m=-5+9=4. hence n+m=5.
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