# Maths SENIOR CHALLENGE!

This discussion is closed.
18 years ago
#21
(Original post by GingerIsKing)
I have that tomorrow as well. I have not done any before and have only recently seen a past paper.
Past paper???! We just used to wander in one morning and our teacher would say, "Right, I signed you all up for this Maths challenge thing..."

Relax. It's not an exam. You're supposed to enjoy it...
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18 years ago
#22
E is correct

W, X,Y,Z are all prime and 2002 is even so W say is 2
Therefore 2*1001
Product of Three no is ~ 1000 so each must be around 10
clearly 3, 5 not true, 7? yes 7 *143
so 2*7*143
2*7*11*13
so 2^2=4
7^2=49
11^2=121
13^2=169
Sum = 343 ans E
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18 years ago
#23
(Original post by Phil_C)
E is correct

W, X,Y,Z are all prime and 2002 is even so W say is 2
Therefore 2*1001
Product of Three no is ~ 1000 so each must be around 10
clearly 3, 5 not true, 7? yes 7 *143
so 2*7*143
2*7*11*13
so 2^2=4
7^2=49
11^2=121
13^2=169
Sum = 343 ans E
Why have you assumed that for the product of three numbers to be about 1000 for them all to be roughly equal to 10?
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18 years ago
#24
(Original post by Ralfskini)
Why have you assumed that for the product of three numbers to be about 1000 for them all to be roughly equal to 10?
Because 10^3 = 10x10x10 = 1000?
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18 years ago
#25
(Original post by ZJuwelH)
Because 10^3 = 10x10x10 = 1000?
yes, so is 2 * 25 * 20.
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18 years ago
#26
(Original post by Ralfskini)
yes, so is 2 * 25 * 20.
Two of which are not primes...
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18 years ago
#27
(Original post by ZJuwelH)
Two of which are not primes...
Yes but 10 isn't prime. I'm just saying......

I wasn't suggesting that as a possible answer, just that the numbers dont have to be approximately equal to 10. Does anybody else see where I'm coming from?
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18 years ago
#28
(Original post by Ralfskini)
Yes but 10 isn't prime. I'm just saying......

I wasn't suggesting that as a possible answer, just that the numbers dont have to be approximately equal to 10. Does anybody else see where I'm coming from?
I know but the assumption seemed to work. No need to fix what ain't broke...
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18 years ago
#29
(Original post by ZJuwelH)
I know but the assumption seemed to work. No need to fix what ain't broke...
True it worked but it was not logical. Its like saying 'two numbers have to add together to make 50 so ill just assume that each one is approximately equal to 25.' What about 49 + 1?
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18 years ago
#30
(Original post by Ralfskini)
True it worked but it was not logical. Its like saying 'two numbers have to add together to make 50 so ill just assume that each one is approximately equal to 25.' What about 49 + 1?
Try looking at the answer without the 10 bit. Looks better like that I reckon.
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18 years ago
#31
(Original post by ZJuwelH)
Try looking at the answer without the 10 bit. Looks better like that I reckon.
Agreed.
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18 years ago
#32
(Original post by Ralfskini)
Agreed.
At last hahaha!
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18 years ago
#33
(Original post by Ralfskini)
Why have you assumed that for the product of three numbers to be about 1000 for them all to be roughly equal to 10?
Knowing the first is 2 the smallest of all primes, the others must product to 1001 which is just a little larger than 10^3, 1000. Gives you a starting point to search for them and given that you are searching for three values, if they were large, eg 31 to pull a prime form the ether, then their product would far exceed the 1001 target.

PC
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18 years ago
#34
Your idea of investigating two values suming to 50 so go in the middle is not similar, unless there was further evidence that the values we are looking at are around the middle. In this instance I knew they could not be large and key small primes didn't fit. It is then a case of knowing your tables or a logical search
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18 years ago
#35
Good luck all with the Senior Maths Challenge!!!

Any mod going to make a short-term sticky on it???
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18 years ago
#36
I arrived late for maths challenge so only got and hour to do it.
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18 years ago
#37
So, did anybody take the challenge or what?
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18 years ago
#38
(Original post by Ralfskini)
So, did anybody take the challenge or what?
I took it. I think it went ok, but on some questions I ended up with answers that weren't any of the choices, whoops. I suck at maths, so I'm not gonna be upset when I don't get a certificate.

How do you think you did?
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#39
Well! I did the test today and it was hard! hope you all did well in it!
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18 years ago
#40
(Original post by sock)
I took it. I think it went ok, but on some questions I ended up with answers that weren't any of the choices, whoops. I suck at maths, so I'm not gonna be upset when I don't get a certificate.

How do you think you did?
I rekon I would have got a gold with the extra half hour. I only answered the first 17 questions. Ah well. I probably did ok.
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