Brain Teasers
Brain Teasers Trivia Mentalrobics Games Community
Personal Links
Submit a Teaser
Your Favorites
Your Watchlist
Browse Teasers
All

Cryptography
Group
Language
Letter-Equations
Logic
Logic-Grid
Math
Mystery
Optical-Illusions
Other
Probability
Rebus
Riddle
Science
Series
Situation
Trick
Trivia

Random
Daily Teasers
Search Teasers

Advanced Search
Add to Google Add to del.icio.us

More ways to get Braingle...

Class Photo

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

 

Puzzle ID:#25168
Fun:*** (2.61)
Difficulty:*** (2.95)
Category:Logic
Submitted By:cnmne*us*****
Corrected By:cnmne

 

 

 



Jacob's class picture has 40 photos arranged in a 8 x 5 grid. The photos in the top row are numbered 1 through 8 from left to right, with the photos in the remaining rows similarly numbered (as shown below). Given the following clues (bordering includes horizontal, vertical, and diagonal), where is Jacob's picture?

X X X X X X X X (1 - 8)
X X X X X X X X (9 - 16)
X X X X X X X X (17 - 24)
X X X X X X X X (25 - 32)
X X X X X X X X (33 - 40)

1) There are 20 boys and 20 girls.
2) Each row and column has at least two girls, but no more than four girls.
3) Every girl borders at least one other girl.
4) Girls are located at positions that are prime numbers.
5) Boys are located at positions that are either squares or cubes.
6) Jacob is the only boy that borders a unique number of girls.





What Next?

  
  

See another brain teaser just like this one...

Or, just get a random brain teaser

If you become a registered user you can vote on this brain teaser, keep track of
which ones you have seen, and even make your own.

 



Comments

BHSChorusGirl**
Aug 12, 2005

You lost ME
(user deleted)
Aug 13, 2005

Either the answer is 8, (uniquely boardered by 1 girl) or you need one more clue, because the only way to come to any conclusion is to realize every row must have 4 girls in it to add up to 20. Which leaves you guessing repeatedly and not solving anything. Also, in the answer explaination, girls must be added to columns 2,4,6 & 8 not 2, 4, 6, & 7. 7 already had the min. 2 girls in it.
cnmne*us*
Aug 14, 2005

You are correct about being column 8, not 7. I am submitting the correction. However, the rest of the clues and steps are correct. The boy at position 8 borders 1 girl, but so does the boy at position 1, so that is not unique.
STVB
Aug 18, 2005

I liked this one, thanks! Solved it without a problem, but liked the brain exercise!
kayl_bayl**
Aug 22, 2005

wow that was a long one!
mbunap*
Aug 23, 2005

I had it correct down to that final choice of pairs. But not having worked the problem in the same order shown in your solution, the fact that the solution hinged on the 20/32 and 24/28 choice was not apparent. Having considered that you might have made a mistake and there was no unique number of girls, I did not attempt to rearrange the seating to create a unique situation. It was a good teaser. I was just lazy.
(user deleted)
Sep 12, 2005

I'm a little confused! Isn't (1) a prime number?
miyukina*
Dec 21, 2005

another minesweeper version! i love every step of it's elimination reasoning...one of my easy breezy 2 mins teasers...
39 na!
(user deleted)
Mar 28, 2006

Actually, there seems to be another solution to this question.

B G G B G B G B
B B G G G G B B
G B G B B(B)G G
B G B B G G G B
G B B G G B B G

And with Jacob sitting at position 22 in this matrix, you still would have him as the unique guy with 6 girls bordering him.
cnmne*us*
Mar 28, 2006

srik, your solution has a girl at position 36, which, by clue 5, must be a boy.
scallioAus*
Jan 11, 2008

Boy did I blow that one. Had to go back and re-work it because I read the "squares or cubes" question as literally. I was trying to put the boys in the grid in squares! For example, 1, 4, 25, 28 made a nice square! Since the first row already had 4 girls, I filled in the remaining top spots with boys and then tried to make squares of the boys in the grid. Felt silly after reading the answer.

Great teaser the second time through!
Zarahemla05Aus*
Feb 18, 2008

I didn't get it, but that's nothing new. I'm not good at Logic Problems, have finished very few. But I keep trying! LOL
Thanks! ~Z
bfriedfischtom
Apr 10, 2008

I don't get that solution.
The girl at 26 does NOT border any other girl! Am I the only one to see this or am I utterly confused:

The only solution in my opinion is position 16 bordering 0 Girls.
There are 2 grids, both have him at 16 though. Here it is:
BGGBGBGB
BBGGGGBB
GBGBBGGB
BBBGGBGG
GGBBGBBG
If somone tells me that this is correct I might show you how to get it
bfriedfischtom
Apr 11, 2008

I see now my mistake, bordering also is valid **diagonally**, additionally one of my girls does not border any other



Back to Top
   



Users in Chat : FlandersE 

Online Now: 4 users and 679 guests

Copyright © 1999-2014 | Updates | FAQ | RSS | Widgets | Links | Green | Subscribe | Contact | Privacy | Conditions | Advertise

Custom Search





Sign In A Create a free account