Habs Maths 2010 - Answer to Question - 30 - please help
Moderators: Section Moderators, Forum Moderators
Habs Maths 2010 - Answer to Question - 30 - please help
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
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
Re: Habs Maths 2010 - Answer to Question - 30 - please help
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
-- 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
-
- Posts: 888
- Joined: Wed Aug 01, 2007 12:19 pm
Re: Habs Maths 2010 - Answer to Question - 30 - please help
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
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
Re: Habs Maths 2010 - Answer to Question - 30 - please help
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?
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?
Re: Habs Maths 2010 - Answer to Question - 30 - please help
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
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
-
- Posts: 888
- Joined: Wed Aug 01, 2007 12:19 pm
Re: Habs Maths 2010 - Answer to Question - 30 - please help
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 atmshailesh 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
Re: Habs Maths 2010 - Answer to Question - 30 - please help
Sorry to go off the topic - where can I get Habs past papers for Maths? My son is applying this year
Thanks
Thanks
Re: Habs Maths 2010 - Answer to Question - 30 - please help
The paper is on their website.
You'll find the question referred to here at the end of the "Maths 2010" paper.
You'll find the question referred to here at the end of the "Maths 2010" paper.
Re: Habs Maths 2010 - Answer to Question - 30 - please help
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