Go to navigation
It is currently Sun Dec 04, 2016 12:18 pm

All times are UTC




Post new topic Reply to topic  [ 4 posts ] 
Author Message
PostPosted: Tue Jan 17, 2012 9:59 am 
Offline

Joined: Thu Feb 10, 2011 2:31 pm
Posts: 79
Dear all,
Help is needed to understand how to do this math question ii) ?

Thanks very much in advance for your time and answer.

Best regards.
Shagor21

http://www.evernote.com/shard/s125/sh/d ... eda9170ef9


Top
 Profile  
 
PostPosted: Tue Jan 17, 2012 11:01 am 
Offline

Joined: Thu Feb 24, 2011 12:34 pm
Posts: 207
You have numbers on one of the diagnonals (15+5+12+2), which adds up to 34. You then know that every row and column plus diagnonal should add up to 34.
This is what I end up with:

14 11 7 2
1 8 12 13
4 5 9 16
15 10 6 3


Top
 Profile  
 
PostPosted: Sat Jan 28, 2012 6:22 am 
Offline

Joined: Wed Jan 25, 2012 7:43 pm
Posts: 189
The key I would think is to find the answer without having to complete the magic square.

Let us call the funny symbol as X (the answer we need to find).

One can see that the first column (which has X) and the third row share a common cell. Let us call it C.

In which case, the sum of first column is = 14 + X + C + 15 = 29 + X + C

Sum of the third row is = C + 5 + 9 + 16 = 30 + C

As it is a magic square, the sum of first column and third row need to be equal to each other i.e.

29 + X + C = 30 + C

X is therefore equal to 1 :)


Top
 Profile  
 
PostPosted: Mon Jan 30, 2012 10:44 am 
Offline

Joined: Tue Oct 04, 2011 8:44 am
Posts: 1390
Location: Reading
I just did:

sum the diagonal that is fully populated to get 34

then fill in the missing value below the smiley by summing the 3rd row:

34- (5+9+16) = 4

then find the smiley by summing down its column:

34- (14+4+15) = 1


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 4 posts ] 

All times are UTC


Who is online

Users browsing this forum: No registered users and 2 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
CALL 020 8204 5060
   
Privacy Policy | Refund Policy | Disclaimer | Copyright © 2004 – 2016