You add each number of 1 row to its respective column.
x = -2
y = -9
z = 0
e = 10
f = 5
n is obtained by adding y to e which in this case is -9+10 = 1
m is obtained by adding z to 4 which in this case is 4
so m+n = 4+1 = 5.
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m+n
Source: Beat The GMAT — Problem Solving |
could you kindly please show how to do that? by the answers u gave i can't really figure it out... sorryssmiles08 wrote:You add each number of 1 row to its respective column.
sure.shibal wrote:could you kindly please show how to do that? by the answers u gave i can't really figure it out... sorryssmiles08 wrote:You add each number of 1 row to its respective column.
I don't have my regular excel spreadsheet, so you might have to make yourself a chart on paper or something.
you have to add 4 to x to produce 1.
4 + x = 1; say in this case x = -3
now we know x. lets add x to e to produce 7
-3 + e = 7; e= 10
f+x = 2
f - 3 = 2; f = 5
now we know e, f, x.
4 + y = -5; y = -9
y + e = n; -9 + 10 = 1 (this is the value we need)
y + f = -4, since we already figured out y and f, this can stand as our verification to see that we calculated y and f correct. -9 + 5 = -4 (YES)
z = 0, b/c (z + f) = 5 since f = 5, z = 0. Similarly with z + e = 10. e is 10, z = 0.
from this we can conclude that 4 + 0 = 4(m)
so m = 4, n= 1. 4 + 1 = 5
note that we really didn't need to calculate all of the values in the chart, but it helps as a checking point during the exam.
-hope this helps.
