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Mathematics

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9 likes 1.6
(Very easy)
Sold! in Mathematics
A dealer bought a painting for $70, sold it for $80, bought it back for $90, and sold i...
Added about 1 year ago by city_slick currently with 36 comments
7 likes 2.2
(Fairly Easy)
Troll Toll in Mathematics
You are on your way to visit your Grandma, who lives at the end of the valley. It's her...
Added about 1 year ago by copter currently with 13 comments
5 likes 2.3
(Fairly Easy)
Prime Numbers in Mathematics
Can the mean of any two consecutive prime numbers ever be prime?
Added about 1 year ago by copter currently with 26 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 20 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 10 months ago by kash currently with 16 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 11 months ago by kash currently with 37 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 10 months ago by raki currently with 31 comments
2 likes 3.0
(Fairly Easy)
Simple maths in Mathematics
The world's tallest skyscraper took 7 years to build. Each year the workmen were able t...
Added 2 months ago by Marlaller currently with 31 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 10 months ago by ace currently with 46 comments
13 likes 3.2
(Fairly Easy)
The Easy Sum of 1..100? in Mathematics
Quick,without using a calculator, what is the sum of all numbers between 1 and 100 incl...
Added about 1 year ago by Valentin currently with 32 comments
4 likes 3.5
(Fairly Easy)
Stranded on an Island! in Mathematics
7 men are stranded on an island. They gather up all the coconuts and divide them into 7...
Added about 1 year ago by roscoe currently with 37 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 6 months ago by GreatGray currently with 17 comments
7 likes 4.0
(Moderate)
Gone Camping in Mathematics
Camp Crona's cook, Allison, was just about to begin preparing the picnic lunch for all ...
Added about 1 year ago by johnp currently with 30 comments
5 likes 4.0
(Moderate)
The Square Year in Mathematics
"I was n years old when the year was n^2," said Smith in 1971. When was he born?
Added about 1 year ago by Valentin currently with 13 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 41 comments