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More ways to get Braingle...

Aliens

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

 

Puzzle ID:#29774
Fun:*** (2.58)
Difficulty:*** (2.16)
Category:Logic
Submitted By:npf2005*
Corrected By:Winner4600

 

 

 



100 aliens attended an intergalactic meeting on earth.

73 had two heads,
28 had three eyes,
21 had four arms,
12 had two heads and three eyes,
9 had three eyes and four arms,
8 had two heads and four arms,
3 had all three unusual features.

How many aliens had none of these unusual features?




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Comments

zonarita*us*
Apr 15, 2006

I got 27. How did you get the answer 4?
npf2005*
Apr 16, 2006

its pretty complicated
(user deleted)
Apr 16, 2006

I got 7 the first time but after seeing the answer I figured out where I went wrong
roscoep**
Apr 17, 2006

Nice set and su-set puzzle.
roscoep**
Apr 17, 2006

Nice set and SUB-set puzzle.
brainsterAin*
Apr 17, 2006

It was interesting to read, but I have to admit I did not reach the desired answer. Would love to see an explanation added to that for more information and clarity if you could!
awishfulthinker*us**
Apr 23, 2006

You guys know how to draw venn diagrams??(you know the interconnecting circles) because thats how you solve this... I got 4 on my first try.

56 had only two heads
10 had only three eyes
7 had only 4 arms

9 had only two heads and three eyes
5 had only two heads and four arms
6 had only three eyes and four arms

3 had three eyes, four arms, and two heads.

if you draw the venn diagram its very easy
NomadShadow*us*
Apr 23, 2006

Quite fun, but I didn't need to draw ven diagrams to solve this, it's just like the total area of three intersecting circles (C1 , C2 , C3). It's the sum of all areas minus the sum of all binary intersections plus the little area where all circles intersect.

In this case it was 73 + 28 + 21 - 12 - 9 -8 + 3 = 96 alien with unusual features, leaving only 4 aliens without any of these features. lol
tonjawithaj*us*
Apr 28, 2006

AWESOME!!! Woot!
komoncents
May 05, 2006

did you doublecount something? better sub it out.
jeffmartin134*us*
May 08, 2006

i liked it



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