Welcome to MindCipher, a social repository of the world's greatest brain teasers, logic puzzles and mental challenges.

Jay Elliott

Comments 16

The Monty Hall Problem

This can definitely be solved using Baye's Rule, but it may be easy to get lost in the math. The Carlton solution in the Show Solution box is definitely the easiest to understand.

context
Up and Down

With that logic, he could just carry the umbrella everyday :-)

context
Crazy Google Interview Question

I've heard this solution before. This would assume you stay perfectly centered on the axis of rotation and can keep yourself in good balance.

context
Bit Pair Swap

I agree with ravi, your solution doesn't work.

context
3 Coins

Are you sure? How did you arrive at your answer?

context
Crazy Google Interview Question

Assuming it's a standard blender with two blades connected perpendicularly to the axis of rotation, I would just stand on the axis of rotation. I would rotate with the blades, but would probably live...

context
3 Coins

Nice! Solid explanation.

context
Parodoxical Statements from Life

Touché, although I assume the question is invariant to language changes.

context
Odd Pills

Woah, nice solution. Similar motivation to the solution I posted, but much cleaner once you work through it.

context
Odd Pills

The solution is explained in detail under "Show Solution", but the key idea is that you take different amounts of pills from each jar so you'll know exactly which jar has the pills with a different weight.

For example, if jar 2 has the 9 gram pills and you picked 2 pills from jar 2, the total weight of the pills will be 2 grams less than the expected weight

Expected weight of pills coming from jar 2: 2 x 10g = 20g Actual weight of pills coming from jar 2: 2 x 9g = 18g

context
Good luck at an interview with Google

I think you might have to take into account how tightly you can pack spherical balls into some volume. With 12,000 inches^3, you would only be able to fit 3,000 balls if they were all perfectly packed together.

Check this out: Close-packing of equal spheres

context
Bug's Eye

Agreed. I think the same diagram without the red path would be ideal.

context
Psycho Killer

That too, the fact that she's scoping out dream guys at her mother's funeral is pretty messed up.

context
Good luck at an interview with Google

I think the question might be asking what the total cost of washing all windows in Seattle would be, with some assumed market rate for washing windows.

Why bilingual advertisement? There's more than 2 languages in the world. Also, what if the advertisement doesn't reach all of the piano tuners worldwide? If it does reach everyone in the world, what if it is seen in a region that doesn't speak one of the two languages?

context
No if() Only abs()

Isn't that just 1/2?

context
All the King's Wine

+1 Michael. This same problem without a supporting story would just be ridiculous.

context

Submitted Puzzles 2

20 5 Odd Pills
Your pharmacist gives you 5 jars filled with pills. The pills contained in each jar have an identical appearance and size (i.e. if you mixed all of the pills you wouldn't be able to tell them apart). ...
Doable
3.6
5 Count The Bits
Write a function that counts the number of bits in an integer that are set to 1 that is linear in time complexity in the worst case, but sub-linear on average.
Hard
7.6