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Mathematics

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3 likes 3.3
(Fairly Easy)
Simple maths in Mathematics
The world's tallest skyscraper took 7 years to build. Each year the workmen were able t...
Added 3 months ago by Marlaller currently with 36 comments
4 likes 3.5
(Fairly Easy)
A Guess-my-rule Problem in Mathematics
Guess the rule: 1254 is 13 4097 is 36 1111 is 2 2222 is 8 3478 is 53 1010 is 1 ...
Added 7 months ago by GreatGray currently with 20 comments
5 likes 5.0
(Moderate)
I enjoy Random Walks on the Beach in Mathematics
There is a MxN grid (see picture) of spots. You start from the top left spot and go to...
Added 9 months ago by kash currently with 34 comments
13 likes 3.0
(Fairly Easy)
What number is next? in Mathematics
What number comes next in this sequence? 4, 20, 56, 120, 220, ?
Added 11 months ago by ace currently with 49 comments
4 likes 2.8
(Fairly Easy)
Hit the Target in Mathematics
Jim hits the target 90 out of 100 times. Charlie hits the target 80 out of 100 times...
Added 11 months ago by kash currently with 18 comments
3 likes 3.0
(Fairly Easy)
Beverages in Mathematics
You have only 4 different kinds of beverages in bottles of equal capacity. You have unl...
Added 11 months ago by raki currently with 34 comments
10 likes 6.3
(Challenging)
Birthday Problem (Classic) in Mathematics
A classic problem. How many people do you need to have in a room so that the probabi...
Added about 1 year ago by Dusty currently with 20 comments
12 likes 5.5
(Moderate)
Divide 1 to 20 in Mathematics
What is the smallest whole number that can be divided by any number from 1 to 20 (inclu...
Added about 1 year ago by Dusty currently with 25 comments
4 likes 2.8
(Fairly Easy)
Bricks in Mathematics
One brick is one kilogram and half a brick heavy. How much does one brick weigh in k...
Added about 1 year ago by kash currently with 40 comments
6 likes 4.0
(Moderate)
Prisoners and hats in Mathematics
100 prisoners are standing in a line each 1 seeing the back of the ones in front of him...
Added about 1 year ago by jakab922 currently with 44 comments
23 likes 4.9
(Moderate)
The fake coin in Mathematics
You have 9 coins which all look identical but 1 of them weight less than the others. Yo...
Added about 1 year ago by jakab922 currently with 22 comments
4 likes 2.3
(Fairly Easy)
Cargo Boat Statistics in Mathematics
It is shown that 2% of fruit boats arrive with their cargoes ruined. If two boats arriv...
Added about 1 year ago by vladnik_stylez currently with 23 comments
5 likes 4.3
(Moderate)
Buying Books in Mathematics
Two friends, Alex and Bob, go to a bookshop, together with their sons Peter and Tim. Al...
Added about 1 year ago by copter currently with 41 comments
7 likes 5.8
(Moderate)
All Apples in Mathematics
On the market, mrs. Jones and mrs. Smith sell apples. Mrs. Jones sells her apples per t...
Added about 1 year ago by copter currently with 19 comments
17 likes 4.2
(Moderate)
100 Balls, 2 Jars in Mathematics
You have 2 jars, 50 red balls, and 50 blue balls. You need to put all the balls into t...
Added about 1 year ago by kash currently with 17 comments