All Questions
27,717
questions
5
votes
1
answer
56
views
Guessing whether the revealed number is higher
Consider the following game:
Two real numbers are independently, randomly, uniformly chosen from the interval [0, 1].
Andrew is secretly shown the two numbers. He must choose one of the numbers and ...
- 1,596
1
vote
0
answers
44
views
How many squares in a large square [closed]
How many squares of all sizes can be found on a large square made of 10000 small squares? I don't want to try them out or count them. I tried finding a pattern, as in a square made of 1^2 small square ...
- 11
3
votes
1
answer
468
views
Explain why "Calf" is the answer to "Ice mass broken off a little lower?"
This question is 18 across in puzzle No 33, The Sun Two-Speed Crossword book...
Q: Ice mass broken off a little lower?
A: Calf
Some of my thought processes are: Ice (diamonds?); ice mass (iceberg?);...
- 133
0
votes
2
answers
405
views
6 balls, one is either heavier or lighter, find the odd ball in minimum weighings [duplicate]
You have 6 balls, of which one is either heavier or lighter, and you do not know which of the two situations it is. The other 5 balls all weigh the same.
You have a balance scale. What is the minimum ...
- 3,183
7
votes
1
answer
943
views
Wait a minute, this *is* 1 across!
Solve on Penpa+
Across
1. Woman in white dress gets good partner that's worth marrying, as he can let 1 across? (12)
9. Big name in French cinema, Jean, with one Oscar, ultimately (6)
11. East Asian ...
- 78.5k
2
votes
1
answer
191
views
Blindfolded tic-tac-toe with a twist
You're playing tic-tac-toe and you're blindfolded.
The objective is to never lose, winning when given the chance under the classic ruleset of the game.
The player who succeeds in placing three of ...
- 21
-3
votes
1
answer
207
views
My Friend's Salary [closed]
My salary is $2,000, I am of Armenian descent and am 31 years old.
However my friend, is of German descent and is 26 but he earns $8,000.
I think this is blatant discrimination but can you guys find ...
- 305
9
votes
1
answer
203
views
Connect Wall With A Fun Fact
Instructions:
• Four mystery words are replaced with a double question mark and must be deduced by the solver. NOTE: words are not necessarily in alphabetical order after the mystery words are ...
- 7,770
5
votes
1
answer
263
views
Times of a hidden order
The goal is to find the 6th time of a set of six different times on a clock. In order for this set of times to be complete, what time must replace the question mark? As usual, explain why.
- 36.6k
5
votes
3
answers
710
views
Is it possible to arrange the free n-minoes of orders 2, 3, 4 and 5 into a rectangle?
To be explicit, the shapes pictured below, with reflections permitted.
Can these be packed into a rectangle?
This puzzle arose from discussion on r/mathmemes. No solution was posted (and I don't know ...
- 3,168
7
votes
1
answer
1k
views
How much is USA - Brazil?
Given that:
France - China is 4
Morocco - USA is $+\infty$
And
Laos - India is 1
Preliminary question
Can you give the value of USA - Brazil?
Puzzle question
What is the highest finite value that ...
- 6,103
0
votes
0
answers
116
views
How many uncoordinated cubers does it take to solve a Rubik's cube with multiple solutions?
Inspired by Rubik's cubes with multiple sets of colors or stickers. Suppose there's a Rubik's cube with multiple solutions (represented by multiple sets of colors) made with special paint that reflect ...
- 189
5
votes
0
answers
127
views
Who are these rooks?
Here is my newest retrograde chess puzzle, perhaps a bit on the trickier side once again:
Can you determine the origin of each of the four rooks in this position?
Please provide your reasoning and a ...
- 2,295
1
vote
1
answer
118
views
Puzzle with crosses and boxes
This is a question asked from a Reddit user
https://www.reddit.com/r/iqtest/comments/1drjv9i/what_do_you_think/#lightbox
- 39
22
votes
1
answer
3k
views
What’s the highest salary the greedy king can arrange for himself?
A little kingdom contains 66 people, a king and 65 citizens. Each of them, including the king, has a salary of one gold piece. When democracy comes, the king is denied a vote, but he has the power to ...
- 12.4k