Addition problem

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B166418: Senior | Next Rank: 100 Posts; Posts: 82; Joined: Sat Mar 26, 2011 4:59 am; Thanked: 4 times

by B166418 » Sun Jul 03, 2011 8:53 am

1 -5 m 4
7 n 10 e
2 -4 5 f

X Y Z +

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

(A) -19
(B) 4
(C) 5
(D) 6
(E) 22

Source: Beat The GMAT — Problem Solving | Sun Jul 03, 2011 8:53 am

amit2k9: Master | Next Rank: 500 Posts; Posts: 461; Joined: Tue May 10, 2011 9:09 am; Location: pune; Thanked: 36 times; Followed by:3 members

by amit2k9 » Sun Jul 03, 2011 11:07 pm

m=z+4
n= y+e

x+e=7
z+e = 10

now, x+4=1 means x=-3
y+4=-5 means y=-9

e = 10. thus z = 0.

hence m = 4 and n = -9+10 = 1

m+n = 5

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