Addition Table

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k_suraj786: Newbie | Next Rank: 10 Posts; Posts: 8; Joined: Sat Apr 22, 2006 8:49 am; Location: Mumbai

by k_suraj786 » Sat Apr 22, 2006 9:52 am

+ X Y Z
4 1 -5 M
E 7 N 10
F 2 -4 5

In the addition table shown above, what is the value of M + N =?

A. -19
B. 4
C. 5
D. 6
E. 22

SKK

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Source: Beat The GMAT — Problem Solving | Sat Apr 22, 2006 9:52 am

dkiran01: Junior | Next Rank: 30 Posts; Posts: 27; Joined: Sun Apr 09, 2006 9:07 pm; Location: Hyderabad,India; Thanked: 28 times

by dkiran01 » Sat Apr 22, 2006 5:15 pm

is the answer "C"

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beatthegmat: Site Admin; Posts: 6778; Joined: Mon Feb 13, 2006 8:30 amFollowed by: 994 members; Location: Los Angeles, CA; Thanked: 1249 times

by beatthegmat » Sat Apr 22, 2006 8:32 pm

Can you show us how you got to that answer?

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chix475ntu: Junior | Next Rank: 30 Posts; Posts: 12; Joined: Mon Apr 17, 2006 10:59 am; Thanked: 2 times

by chix475ntu » Sun Apr 23, 2006 5:11 am

4+y=-5 ==> y = -9
4+z=m

e+y=n ==> e=n+9
e+z=10 ==> n+9+z=10 ==> n+z=1 ==> n+m-4=1
==> n+m=5

C

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dkiran01: Junior | Next Rank: 30 Posts; Posts: 27; Joined: Sun Apr 09, 2006 9:07 pm; Location: Hyderabad,India; Thanked: 28 times

by dkiran01 » Sun Apr 23, 2006 5:53 am

hey chix475ntu,

thanks for the explanation, was away with some busy work. So guys the answer is C

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k_suraj786: Newbie | Next Rank: 10 Posts; Posts: 8; Joined: Sat Apr 22, 2006 8:49 am; Location: Mumbai

by k_suraj786 » Sun Apr 23, 2006 7:54 am

Hey chix475ntu,

Thanks a lot.......for ur mentoring...

This website is really worth. God may bless u guys for spending time in solving such tricky problems.

SKK

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Hiran: Newbie | Next Rank: 10 Posts; Posts: 6; Joined: Wed Apr 26, 2006 5:12 pm; Location: Delaware

thanks

by Hiran » Sat Apr 29, 2006 6:00 am

thanks..that info was useful..

ranji

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tngearhart: Senior | Next Rank: 100 Posts; Posts: 50; Joined: Tue Apr 18, 2006 5:41 pmFollowed by: 1 member; Thanked: 2 times

Wow

by tngearhart » Wed Jul 12, 2006 2:55 pm

I saw a couple of these on my practice tests and never had any idea how to work the problems. Thanks so much for the info. It's a huge relief to know how to do these problems!

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naveen1003: Junior | Next Rank: 30 Posts; Posts: 10; Joined: Thu Jun 09, 2011 12:54 am; Location: India

by naveen1003 » Thu Jun 09, 2011 2:19 am

+ X Y Z
4 1 -5 M
E 7 N 10
F 2 -4 5
In the addition table shown above, what is the value of M + N =?
A. -19
B. 4
C. 5
D. 6
E. 22

M=Z+4
N=Y+E
M+N = Z+Y+E+4 -equation 1
X+4 = 1; X=-3
Y+4=-5; Y=-9
X+E=7; E=10
Z+E=10; Z=0
thus M+N = 0+(-9)+10+4 = 5
IMO C

Last edited by naveen1003 on Thu Jun 09, 2011 3:20 am, edited 1 time in total.

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[email protected]: Legendary Member; Posts: 934; Joined: Tue Nov 09, 2010 5:16 amFollowed by: 14 members; Location: AAMCHI MUMBAI LOCAL; Thanked: 63 times

by [email protected] » Thu Jun 09, 2011 2:56 am

I did not get the above answer. Kindly explain the question plzzz....

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casperkamal: Junior | Next Rank: 30 Posts; Posts: 24; Joined: Mon May 31, 2010 3:29 am; Location: Hyderabad; Thanked: 2 times

by casperkamal » Wed Jun 22, 2011 8:24 am

Just to help others from getting confused as I did, I have created an image of it to make it understandable.

You can also look here for an alternate way...not so different but just for you to know

https://www.manhattangmat.com/forums/in- ... -t470.html

Kamal

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edvhou812: Master | Next Rank: 500 Posts; Posts: 143; Joined: Sat Nov 06, 2010 9:06 pmFollowed by: 1 member; Thanked: 10 times

by edvhou812 » Wed Jun 22, 2011 9:54 pm

Wish I could do this more quickly.

Basically found that E=12 so that E+z=10 becomes 12+z=10 so that z = -2
Y = -9 so that E+Y = n, N=3
eventually got to M = 4+z which is 4-2 = 2.
n+m = 3+2=5

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abhicoolmax: Junior | Next Rank: 30 Posts; Posts: 18; Joined: Sun Jul 10, 2011 1:13 pm; Thanked: 1 times

by abhicoolmax » Tue Aug 30, 2011 6:40 pm

I didn't know what the heck is an addition table and got it wrong. But after understanding what the heck is this addition table, I think the quickest solution could be:

m + n
= (e + y) + (z + 4)
= (e + y) + ((10 - e) + 4)
= 14 + y
= 14 + (-5 - 4)
= 5

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ronnie1985: Legendary Member; Posts: 626; Joined: Fri Dec 23, 2011 2:50 amFollowed by: 10 members; Location: Ahmedabad; Thanked: 31 times

by ronnie1985 » Sat Feb 04, 2012 2:34 am

Please explain the logic of the addition table first

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