Go to navigation
It is currently Sun Dec 04, 2016 2:20 pm

All times are UTC




Post new topic Reply to topic  [ 9 posts ] 
Author Message
PostPosted: Tue Oct 04, 2011 5:49 pm 
Offline

Joined: Sun Feb 27, 2011 9:54 pm
Posts: 34
All,

Need a Help....

Habs Maths paper Question 30

in the square below each letter stands for a different number

A C D B
A A A C
B D D D
B C A A 100
112 78 76

it is known that the four numbers in the second column add up to 78 and the four numbers in the third column add up to 76

use this information work out the value of c. C=-------------

the four numbers in the first column add up to 112 and the four numbers in the fourth row add up to 100

use this information to work out the remaining values of A, B and D

A = ------------

B = -------------

D = -----------

Regards,
Shailesh


Top
 Profile  
 
PostPosted: Tue Oct 04, 2011 6:14 pm 
Offline

Joined: Sun Mar 21, 2010 5:06 pm
Posts: 267
The formatting got me.. .correction below...

-- Equations
2a + 2b = 112
2c + a + d = 78
2d + 2a = 76
b + c + 2a = 100

-- So we have
a + b = 56
a + d = 36
a + c = 44

-- Finally (after some subs)
a = 23
b = 33
c = 21
d = 13


Top
 Profile  
 
PostPosted: Tue Oct 04, 2011 7:37 pm 
Offline

Joined: Wed Aug 01, 2007 11:19 am
Posts: 888
Doing it in the order it asks:

column 3: D + A + D + A = 76
so halve that to get D + A = 38

column 2: C + A + D + C = 78
subtract D + A to get
C + C = 40
C = 20

row 4: B + 20 + A + A = 100
so B + A + A = 80

column 1:
A + A + B + B = 112
subtract B + A + A to get
B = 32

so A + A = 80 - 32 = 46
A = 23

so D = 15


Top
 Profile  
 
PostPosted: Wed Oct 05, 2011 10:50 am 
Offline

Joined: Tue Aug 02, 2011 12:52 pm
Posts: 96
Having fun on my coffee break with this one!! I did the following:

2A + 2D = 76
2A + 2B = 112

The difference between these 2 sums is 36, therefore 2B must = 2D+36

2A +(2D+36) = 112
A = 19
B = 37
C = 20
D = 19

Am I way off course?


Top
 Profile  
 
PostPosted: Wed Oct 05, 2011 3:42 pm 
Offline

Joined: Sun Feb 27, 2011 9:54 pm
Posts: 34
All, many thanks for help

After going through all 3 answers - i am able to understand reasonsing of aliportico - many thanks that, you are star

aliportico - you made a small mistake - just informing for others understanding

so A + A = 80 - 32 = 48 - Not 46
A = 24

so D = 14


regards,

S


Top
 Profile  
 
PostPosted: Thu Oct 06, 2011 12:18 am 
Offline

Joined: Wed Aug 01, 2007 11:19 am
Posts: 888
shailesh wrote:
aliportico - you made a small mistake - just informing for others understanding

so A + A = 80 - 32 = 48 - Not 46
A = 24

so D = 14


lol! Sorry about that! I know when I was typing that I had 56 in my head from thinking about the 112 bit, must have typed the wrong thing. I find myself saying the wrong word all the time atm :(


Top
 Profile  
 
PostPosted: Fri Oct 07, 2011 9:57 am 
Offline

Joined: Thu Oct 06, 2011 7:40 pm
Posts: 21
Sorry to go off the topic - where can I get Habs past papers for Maths? My son is applying this year

Thanks


Top
 Profile  
 
PostPosted: Fri Oct 07, 2011 11:27 am 
Offline

Joined: Sat Sep 17, 2011 8:09 pm
Posts: 93
Location: Herts
The paper is on their website.

You'll find the question referred to here at the end of the "Maths 2010" paper.


Top
 Profile  
 
PostPosted: Sat Oct 08, 2011 10:29 am 
Offline

Joined: Thu Oct 06, 2011 7:40 pm
Posts: 21
maddad wrote:
The paper is on their website.

You'll find the question referred to here at the end of the "Maths 2010" paper.



Thank You


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 9 posts ] 

All times are UTC


Who is online

Users browsing this forum: No registered users and 1 guest


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