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Twins and Their Mistakes

Logic puzzles require you to think. You will have to be logical in your reasoning.


Puzzle ID:#31768
Fun:*** (2.45)
Difficulty:*** (2.93)
Submitted By:stang99Ain***!




Six sets of twins ( a boy and a girl in every case) made several errors in their history and geography examinations; and it was noted that every girl made precisely the same number of errors as her brother in the two subjects. Name each pair of siblings and their surname and work out how many mistakes each made in their history and geography examination papers.

1. The boy (not Luke) whose sister is Louella made more history errors than Sammy.
2. George did better in history than the boy surnamed O'Connell, who made either one more or one less geography error than the twins surnamed Dean.
3. Anne made either one more or one less geography error than Louella.
4. The twins who made 11 geography errors didn't make exactly 11 history errors.
5. David and his sister made either one more or one less mistake in the history exam than the twins who made 14 geography errors.
6. Edward and his sister did worse at history than the pair who made 15 geography errors. Edward made one more error in the geography exam than Luke.
7. The McCall twins didn't make one less history mistake than the Vole twins.
8. Susan (who made seven history errors) made one less geography error than the girl who made one less history error than Anne.
9. The twins surnamed Waters made one more history mistake than the twins surnamed Seal, who made more geography errors than the McCall twins.
10. Gail made one more geography error than the girl who made one more history error than Louella.
11. Martin made either one more or one less geography error than his best friend and his sister, who made more history mistakes than Diane.
12. Wendy and her brother (who didn't make eight history mistakes) didn't make as many errors in geography as George and his sister.

Brothers are David, Edward, George, Luke, Martin & Sammy.
Sisters are Anne, Diane, Gail, Louella, Susan & Wendy.
Surnames are Dean, McCall, O'Connell, Seal, Vole & Waters.
Geography errors are 10, 11, 12, 14, 15 & 16.
History errors are 6, 7, 8, 10, 11 & 12.

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Jul 14, 2006

I was hard and I got it all wrong so
Jul 14, 2006

I mean "It" not "I"
Jul 14, 2006

logic grid
Jul 14, 2006

Jul 14, 2006

it wasn't fitting in the logic grid, i actually found it boring ...but then i got 50 points!
Jul 15, 2006

It was hard and i didnt get it at all
Jul 18, 2006

I'm starting to wonder if we have enough data for this one. I love Logic Grid puzzles, but I can't get this one after a couple hours staring at the clues. Has anyone solved it yet?

My first grid didn't work so I devised 2 new ones- one for Geography and one for History. Under each of these is 4 columns and 6 rows. Columns: number of errors, boys, girls, surname.

For example in the Geography grid on the line for 16 errors the line reads "no Luke, no Wendy Bro. // no Susan, no Wendy // no McCall".

If anyone else has a better grid pattern, please advise.

I haven't given up yet... just had to check in to see if anyone else has solved it.

Aug 31, 2006

I'm surprised to see so many negatives on this one. It was quite hard- took me about three hours (-> all day, with interruptions) but it's nice to have a challenge- very satisfying to solve.
At first I thought it should be a grid problem, but the grid I drew didn't tell me anything at first. Then I wrote the clues out as relationships to make them easy to see, like "History: O'Connell>George" and "Geog: Luke+1=Ed" and started writing next to some names which grades were possible. Then I started working out which girl names got which grades- mainly Anne, Louella, and Gail, which took some trial-and-error, but soon I eliminated all but one possibility for those three, and the rest came along nicely from there.
Apr 09, 2007

thank you
Dec 24, 2008

this didn't make too much sense........

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