Pls explain
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Last edited by crackgmat007 on Wed May 27, 2009 8:23 pm, edited 1 time in total.
4+z=m ...1
e+y=n ... 2
adding 1 and 2, m+n=4+z+e+y=(4+y)+(e+z)=-5+10=5
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Addition table
Source: Beat The GMAT — Problem Solving |
the numbers inside the table , at the intersection of the rows and the column are the sums of the row heads and the table heads
