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Offline TylerDurden

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Question for maths geniuses
« on: October 14, 2010, 08:15:40 pm »
I just came across a puzzle I can`t solve(3 rows, 3 columns):-

11 19  29

6   11   16

17 17    ?


So, what is the number that should be in the area covered by the question-mark? Thanks.
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Offline Michael

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Re: Question for maths geniuses
« Reply #1 on: October 14, 2010, 08:25:00 pm »
If it's just about spotting a pattern, I suppose it could be 33.  This would reveal a pattern whereby the final number of each row is the sum of the first two numbers of each row minus 1 eg  11+19=30..30-1=29, 6+11=17..17-1=16, 17+17=34..34-1=33.

Just a quick observation.
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Offline TylerDurden

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Re: Question for maths geniuses
« Reply #2 on: October 14, 2010, 08:38:14 pm »
I can`t believe I missed that. Thanks. I suppose I am more used to simpler equivalents in past IQ tests where one simply checked the differences between the preceding  1st and 2nd numbers and added to or multiplied etc.  the 2nd figures accordingly.
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Offline raw-al

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Re: Question for maths geniuses
« Reply #3 on: October 15, 2010, 02:08:24 am »
I got the same thing Michael but I used a different scheme.

I went vertically;
11 - 5 = 6 +11 = 17
19 - 8 =11 +6 = 17
 Then you add the reds sideways
-5 + -8 = -13 and 29 - 13 = 16 then
+11 + + 6 = + 17 and then +17 + +16 = 33

See the scan.

Your way is easier and I was just proving it by going in another direction.
I love doing these things.
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Cheers
Al

Offline raw-al

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Re: Question for maths geniuses
« Reply #4 on: October 15, 2010, 02:11:04 am »
I reposted with an error in typing fixed.
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Cheers
Al
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