# Best riddles for teens

## Room with no doors or windows

What kind of room has no doors or windows?
A mushroom.
73.43 %

## Three fifth chick

Which city is three fifth chick two third cat and 50% goat?
Chicago.
73.41 %
funny

## What do ghosts wear

What do ghosts wear on their feet?
BOOts.
73.41 %

## Ant and Triangle Problem

Three ants are sitting at the three corners of an equilateral triangle. Each ant starts randomly picks a direction and starts to move along the edge of the triangle. What is the probability that none of the ants collide?
So let’s think this through. The ants can only avoid a collision if they all decide to move in the same direction (either clockwise or anti-clockwise). If the ants do not pick the same direction, there will definitely be a collision. Each ant has the option to either move clockwise or anti-clockwise. There is a one in two chance that an ant decides to pick a particular direction. Using simple probability calculations, we can determine the probability of no collision. P(No collision) = P(All ants go in a clockwise direction) + P( All ants go in an anti-clockwise direction) = 0.5 * 0.5 * 0.5 + 0.5 * 0.5 * 0.5 = 0.25
73.41 %

## The last thing you take off before bed

What is the last thing you take off before bed?
73.41 %
funny

## An orange

What does the orange do, when it takes a test?
It concentrates.
73.41 %

Its ready to walk when I'm all tied up, but really should stop when I'm untied. What am I?
Shoes.
73.41 %
funny

## The king & dentist

Why did the king go to the dentist?
To get a new crown.
73.41 %

## 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.
73.40 %