Four Girls
Logic puzzles require you to think. You will have to be logical in your reasoning.
A man escapes from jail with help from his girlfriend. Four girls are accused of being the man's girlfriend. His girlfriend is lying. Two girls are innocent and telling the truth. The other girl is the man's sister who is helping the girlfriend lie. Who is the man's sister?
Amanda: "Melinda is his girlfriend."
Vanessa: "Eva is lying."
Eva: "Amanda is lying."
Melinda: "Vanessa is not his sister."
Answer
If Amanda is telling the truth, then Melinda is lying. If Melinda is lying, then Vanessa is his sister. If Vanessa is his sister, then she's lying about Eva lying. If Eva isn't lying, then Amanda is lying, which would contradict the fact that Amanda's telling the truth. That means Amanda is lying and could be his girlfriend or sister.
Eva must be telling the truth since Amanda has to be lying. So Vanessa must also be lying, and Melinda is telling the truth. Since Melinda's telling the truth, Vanessa isn't his sister and must be his girlfriend. Amanda is the other liar, so she must be his sister.
Answer: Amanda
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Comments
grilledcheese 
Feb 26, 2008
| Great teaser  |
dswilborn
Feb 26, 2008
| I liked this one - and I figured it out, too. |
Cimorene 
Feb 27, 2008
| it was very confusing but i thought it was really fun and cool  |
sumZ  
Feb 28, 2008
| great plot !! takes some time to figure out
now who'll get in the prison sister or the girl friend? |
friesaregood
Mar 01, 2008
| Wait. So. HUH?  |
DarkMessiah
Mar 01, 2008
| good teaser, I realy liked it |
gracieboo
Mar 17, 2008
| WOW!!! Somehow I did figure it out (the same way you did) but even knowing that, I'm still like "Huh?" |
toucan_dan 
Dec 12, 2008
| Easy! |
Commodity
Dec 12, 2008
| I liked how you really have to put your mind to it too sort everything out, great teaser! |
crazy10man
Dec 12, 2008
| Fantastic! I'm so confused that I don't remember if I got it right or not, but I had fun either way! Good job! |
coolboi
Dec 12, 2008
| That was really confusing. lol |
doehead 
Dec 12, 2008
| Very easy with a little thinking. |
bradon182001
Dec 12, 2008
| The only thing I know for sure is I didn't get it right Great teaser. Thanks for posting.  |
builder
Dec 12, 2008
| I usually get these with the help of pen and paper and enjoy them. This one is no exception. |
Jimmymo
Dec 12, 2008
| Nothin' like a logic matrix to help you work through these! Fun teaser. |
nikitafullmoon
Dec 12, 2008
| Wow. I don't know if the explanation helped or hindered, but I got it right! I'd like to see the symbolic logic diagram behind that. Alas. Braingle is text only. |
kp52
Dec 12, 2008
| I got it right. The explain kind confuses me though. |
dogg6pound9
Dec 12, 2008
| TGIF!!!... i would probably never got that right if it were a Monday morning!!! ... Great teaser, though i explained it to my oldest daughter in a lot less words than you did!!! |
giglet1959
Dec 12, 2008
| Very fun and confusing.
My mom's gonna LOVE this one!! |
coolguy5678
Dec 12, 2008
| Best teaser ever. I love these sorts of logic puzzles where you have to work out who's lying. I worked it out with weird symbols so I'm don't follow your explanation, but I got to the same answer. This is in my favourites list.
One small thing - you said that the sister is helping the GF lie, but you never said outright that the sister is lying herself. I had to make that assumption. |
davidrools
Dec 12, 2008
| Seems to me this also works w/ Vanessa the girlfriend and Amanda the sister.
Amanda's lying, therefore Melinda isn't the GF (check)
Vanessa's lying, therefore Eva's telling the truth when she says that Amanda's lying (check)
Eva's telling the truth that Amanda's lying (because she's the sister)
Melinda is telling the truth about Vanessa not being the sister, because she's the girlfriend. |
davidrools
Dec 12, 2008
| nice! |
davidrools
Dec 12, 2008
| oops please disregard the previous comment...i was thinking the question was asking for the girlfriend, since, according to the story, she's the one to be accused |
EmeraldragoN 
Dec 12, 2008
| This teaser was hard!!! I was so confused that I totally gave up be4 even trying!! It was really fun, though! Keep making those kinds of teasers!! |
westbrook
Dec 12, 2008
| I loved this teaser |
Zarahemla05
Dec 12, 2008
| I can NEVER get these... Good Teaser. |
cutebug
Dec 12, 2011
| It took awhile, but I figured it out. But who would want to be the girlfriend of a jailbird? |
Mandy7
Dec 13, 2011
| funny! |
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