addition problem from gmat prep Q#2

[asadullah100]

i am having problem to solve it... kindly guide me the technique to solve it... thanks..

what is the value of m+n?

+ | x y z

4 | 1 -5 m

e | 7 n 10

f | 2 -4 5

[lalitkc]

what is the value of m+n?

+ | x y z

4 | 1 -5 m

e | 7 n 10

f | 2 -4 5


4 + x = 1 => x = -3
e+ x = 7 => e = 10
f + x = 2 => f = 5
f + y = -4 => y = -9
e + z = 10 => z = 0
e + y = n => n = 1
4 + z = m => m = 4
m + n = 5

[RonPurewal]

what is the value of m+n?

+ | x y z

4 | 1 -5 m

e | 7 n 10

f | 2 -4 5


4 + x = 1 => x = -3
e+ x = 7 => e = 10
f + x = 2 => f = 5
f + y = -4 => y = -9
e + z = 10 => z = 0
e + y = n => n = 1
4 + z = m => m = 4
m + n = 5

yes.

to the original poster: PLEASE POST THE ENTIRE PROBLEM, INCLUDING ALL FIVE ANSWER CHOICES. this is part of the forum rules.

it is weird that they'd expect you to know what an "addition table" is. i haven't seen one of those since third grade.

[RB_51273]

Hi Ron,
I too came across this problem on gmat prep.The flwg are the choices
a)-19
b)4
c)5
d)6
e)22

I have got screen shot of this but attaching at present

Thanks

Ram

[RonPurewal]

Hi Ron,
I too came across this problem on gmat prep.The flwg are the choices
a)-19
b)4
c)5
d)6
e)22

I have got screen shot of this but attaching at present

Thanks

Ram

ok yeah, i recently saw this on gmatprep, too. it's still strange that they expect you to know how to use this table, without any sort of explanation.