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1. Two doors

open both doors and hide between the triangle wedge formed by the two open doors. The dragon goes exploring into the room with the magnifying glass and gets his a** fried. You go into the room where the dragon used to be, and escape. Easy peasy.
2. Three Light Bulbs

How was it? I made it up myself and I was like "boo yeah!" then i saw a similar one on some other riddle site, but the other one wasn't as explanatory and not as good. mine's better. lol ;p it's my own, i swear
3. Three Light Bulbs

i'm not sure how the spoiler BBcode works so here goes:
4. Impossible math 2

i will use V for square root symbol V(-1) = i V(-2) = 2i V(-500) = 500i so on
5. Three Light Bulbs

You are in a closed off room, completely bare, with one windowless door to an adjacent room. There is no way to see light of the second room. There are three light switches on the wall in your room. They correspond to three standard light bulbs in the second room. You can flick any of the light switches any way you want. Then you walk into the second room and you have to know which light switch corresponds to which light bulb. How do you do it?
6. Dying Cows

hehe I was just gonna say that
7. The Tree

so we have to get to tomatoes that dont exist? lol
8. Crocodile Sophism

good one, except i dont think it follows the rules and the croc would eat the baby... in a simpler way, "you will do what you will do" or she couldve just said "1+1=2" but neither of those are okay cuz the croc said "predict what i will do with your baby: will I eat him or give him back?" and if u dont pick either of those he'd probably just eat it i mean she could easily just say "2+2=4" and get the baby back cuz she said the truth, but the croc asked specifically.
9. What is better - eternal bliss or a simple bread?

yeah, this is no paradox. There isn't just two states: Good and Not-Good. there's a huge range of things that are SortofGood, Okay, Bad. You know what i mean? the "nothing" in the statement "Nothing is better than eternal bliss" doesnt refer to the "lack of anything" it means "eternal bliss is better than everything" so its just another play on words, not a true paradox
10. Crocodile Sophism

this is a classic paradox from Martin Gardner's Book of Paradoxes, which has a ton. anyway, the lady says "You will eat my baby." If the crocodile eats the baby, the lady predicted right, so he has to give it to her. But if he gives it to her, she predicted wrong, so he gets to eat the baby... but then she will have predicted right. An endless cycle. Except it's answered easily: I just said this: "If the crocodile eats the baby, the lady predicted right, so he has to give it to her." So he gives it to her, THEN realizes she predicted wrong. by that time, though, she's running away with the baby, and there's nothing the croc can do. that's not what Martin Gardner wrote, but thats how i think of it

a much simpler liars paradox: "This statement is a lie" if its telling the truth then its lying if its lying then its telling the truth Paradox.
12. The Tree

does the river ever freeze? though i guess if it was winter, tomatoes wouldnt be growing. you could get dropped off by a helicopter. or tunnel under. i dont even like tomatoes!