If two fifty-foot ropes are suspended from a forty-foot ceiling that is twenty feet apart, how much rope will you be able to steal if you have a knife?
I don't get anymore wetter, no matter how much rain falls on me.
Can you divide numbers from 1 to 9 (1 2 3 4 5 6 7 8 9) into two groups so that the sum of the numbers of each group is equal? Note: 9 cannot be turned over to make it 6.
What has many keys but can’t open a single lock?
Using mathematical symbols like +, -, and x in order to make the equations correct. Replace # with the above-given symbols. 9 # 8 # 7 # 6 # 5 # 4 = 91
How many bricks does it take to complete a building that is 15 feet wide, 30 feet deep, and 12 feet tall made of brick?
Can you find a number that lies one third of the distance between 1/3 and 2/3?
Can you circle exactly four of these numbers such that the total is twelve? 1 6 1 6 1 6 1 6 1 6 1 6
Count the number of triangles in the given picture.
What is the end of everything?
What is black when you buy it, red when you use it, and gray when you throw it away?
There is a cryptic organization called Cicada 3301 that posts challenging puzzles online, possibly to recruit codebreakers and linguists.
