Best riddles

cleanlogicmathshort

Number 7

How do you make the number 7 an even number without addition, subtraction, multiplication, or division?
Drop the "S".
80.44 %
42 votes

logicshort

Difficult pop quiz

A teacher decides to give a pop quiz one day but all of her students refuse to take the quiz thinking that the teacher will call off the quiz. She can give only one of these students a detention for skipping the quiz. All of the students know each other’s names and if a student knows he/she is getting a detention they take the quiz. How can she threaten her students with the single detention so they all take the quiz?
She tells them that she will give the student who skips the quiz whose name comes first alphabetically a detention. This student won’t skip because they know they are getting a detention if they do. The next person alphabetically will then know that they will get a detention so they won’t skip either, and so on.
80.29 %
55 votes

cleanshortwhat am I

Seas without water

I have seas without water. I have forests without wood. I have deserts without sand. I have houses with no brick. What am I?
A map.
80.29 %
55 votes

interviewlogicmath

Crossing the Bridge Puzzle

Four people need to cross a rickety bridge at night. Unfortunately, they have only one torch and the bridge is too dangerous to cross without one. The bridge is only strong enough to support two people at a time. Not all people take the same time to cross the bridge. Times for each person: 1 min, 2 mins, 7 mins and 10 mins. What is the shortest time needed for all four of them to cross the bridge?
It is 17 mins. 1 and 2 go first, then 1 comes back. Then 7 and 10 go and 2 comes back. Then 1 and 2 go again, it makes a total of 17 minutes.
80.14 %
48 votes

cleanshort

Black when you buy it

What is black when you buy it, red when you use it, and gray when you throw it away?
Charcoal.
80.00 %
41 votes

cleanfunnyshort

Not one single man got wet

Four men were fishing in a boat on the lake. The boat turned over and all four men sank to the bottom of the lake. And yet, not one single man got wet. How is this possible?
All of the men were married.
79.95 %
54 votes