### Fun Facts (Hints)

Hard riddles are universal, and continue to leave a lasting impression on many different cultures across the globe. Here are some interesting facts:
The mere definition of what a riddle is, is something that has drawn a large amount of debate between scholars for centuries.
Complex riddles have been used since ancient times, and extensively in ancient/medieval literature.
There is only one riddle in the Bible appearing in the book of Judges. It is known as "Samson's riddle."
Charades is a popular contemporary game created with the use of riddle.
In author J. R. R. Tolkien's 'The Hobbit' Bilbo Baggins is given a challenging riddle by Gollum, and his life was dependent upon getting the correct answer.

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Riddles and Answers © 2020

## Under The Cup Riddle

You decide to play a game with your friend where your friend places a coin under one of three cups. Your friend would then switch the positions of two of the cups several times so that the coin under one of the cups moves with the cup it is under. You would then select the cup that you think the coin is under. If you won, you would receive the coin, but if you lost, you would have to pay.

As the game starts, you realise that you are really tired, and you don't focus very well on the moving of the cups. When your friend stops moving the cups and asks you where the coin is, you only remember a few things:

He put the coin in the rightmost cup at the start.

He switched two of the cups 3 times.

The first time he switched two of the cups, the rightmost one was switched with another.

The second time he switched two of the cups, the rightmost one was not touched.

The third and last time he switched two of the cups, the rightmost one was switched with another.

You don't want to end up paying your friend, so, using your head, you try to work out which cup is most likely to hold the coin, using the information you remember.

Which cup is most likely to hold the coin?

As the game starts, you realise that you are really tired, and you don't focus very well on the moving of the cups. When your friend stops moving the cups and asks you where the coin is, you only remember a few things:

He put the coin in the rightmost cup at the start.

He switched two of the cups 3 times.

The first time he switched two of the cups, the rightmost one was switched with another.

The second time he switched two of the cups, the rightmost one was not touched.

The third and last time he switched two of the cups, the rightmost one was switched with another.

You don't want to end up paying your friend, so, using your head, you try to work out which cup is most likely to hold the coin, using the information you remember.

Which cup is most likely to hold the coin?

Hint: Write down the possibilities. Remember that there are only three cups, so if the rightmost cup wasn't touched...

The rightmost cup.

The rightmost cup has a half chance of holding the coin, and the other cups have a quarter chance.

Pretend that Os represent cups, and Q represents the cup with the coin.

The game starts like this:

OOQ

Then your friend switches the rightmost cup with another, giving two possibilities, with equal chance:

OQO

QOO

Your friend then moves the cups again, but doesn't touch the rightmost cup. The only switch possible is with the leftmost cup and the middle cup. This gives two possibilities with equal chance:

QOO

OQO

Lastly, your friend switches the rightmost cup with another cup. If the first possibility shown above was true, there would be two possibilities, with equal chance:

OOQ

QOO

If the second possibility shown above (In the second switch) was true, there would be two possibilities with equal chance:

OOQ

OQO

This means there are four possibilities altogether, with equal chance:

OOQ

QOO

OOQ

OQO

This means each possibility equals to a quarter chance, and because there are two possibilities with the rightmost cup having the coin, there is a half chance that the coin is there.

YES NO

The rightmost cup has a half chance of holding the coin, and the other cups have a quarter chance.

Pretend that Os represent cups, and Q represents the cup with the coin.

The game starts like this:

OOQ

Then your friend switches the rightmost cup with another, giving two possibilities, with equal chance:

OQO

QOO

Your friend then moves the cups again, but doesn't touch the rightmost cup. The only switch possible is with the leftmost cup and the middle cup. This gives two possibilities with equal chance:

QOO

OQO

Lastly, your friend switches the rightmost cup with another cup. If the first possibility shown above was true, there would be two possibilities, with equal chance:

OOQ

QOO

If the second possibility shown above (In the second switch) was true, there would be two possibilities with equal chance:

OOQ

OQO

This means there are four possibilities altogether, with equal chance:

OOQ

QOO

OOQ

OQO

This means each possibility equals to a quarter chance, and because there are two possibilities with the rightmost cup having the coin, there is a half chance that the coin is there.

*Did you answer this riddle correctly?*YES NO

## Dropping Coconuts Riddle

You have two coconuts and you want to find out how high they can be dropped from a 100 story building before they break. But you only have $1.40 and the elevator costs a dime each time you ride it up (it's free for rides down).

How can you drop the coconuts to guarantee you will find the lowest floor they will break at, while starting and ending at floor 1?

How can you drop the coconuts to guarantee you will find the lowest floor they will break at, while starting and ending at floor 1?

Hint: They break when dropped from the same height and they don't weaken from getting dropped.

You could drop it at floor 1 first (because you start at floor 1). Then you would go to the floors: 14, 27, 39, 50, 60, 69, 77, 84, 90, 95, 99, and 100. Whatever floor your first coconut breaks at, go to the floor above the last floor the coconut survived and drop the second coconut from this floor. Then go up by one floor until the second coconut breaks and that is the lowest floor it will break at.

YES NO

*Did you answer this riddle correctly?*YES NO

## Coconut Sentence Riddle

Hint: Listen closely...

This.

If 'this' is a coconut, and 'that' is a coconut, then 'is' 'this' a coconut.

YES NO

If 'this' is a coconut, and 'that' is a coconut, then 'is' 'this' a coconut.

*Did you answer this riddle correctly?*YES NO

## The Weight Of A Melon Riddle

Watermelon is 99% water. I have 100 pounds of watermelon. After a week, drying in the sun, the shriveled watermelon had only dried down to being 98% water. What is the total weight of the watermelon now?

Hint: We are to determine X the total mass of melon after the drying.
The Dry weight, DW is 1lb both before and after the drying.
The New Water weight, WNW is clearly X - DW or X - 1

## Give Me Food And I Will Live Give Me Water And I Will Die

Hint:

## Prince Age Riddle

A princess is as old as the prince will be when the princess is twice the age that the prince was when the princess's age was half the sum of their present ages.

What are their ages?

What are their ages?

Hint:

Current Future Past

Princess x 2z (x+y)/2

Prince y x z

I then created three equations, since the difference in their age will always be the same.

d = the difference in ages

x y = d

2z x = d

x/2 + y/2 z = d

I then created a matrix and solved it using row reduction.

x y z

1 -1 0 d

-1 0 2 d

.5 .5 -1 d

It reduced to:

x y z

1 0 0 4d

0 1 0 3d

0 0 1 5d/2

This means that you can pick any difference you want (an even one presumably because you want integer ages).

Princess age: 4d

Prince age: 3d

Ages that work

Princess:

4

8

16

24

32

40

48

56

64

72

80

Prince:

3

6

12

18

24

30

36

42

48

54

60

YES NO

Princess x 2z (x+y)/2

Prince y x z

I then created three equations, since the difference in their age will always be the same.

d = the difference in ages

x y = d

2z x = d

x/2 + y/2 z = d

I then created a matrix and solved it using row reduction.

x y z

1 -1 0 d

-1 0 2 d

.5 .5 -1 d

It reduced to:

x y z

1 0 0 4d

0 1 0 3d

0 0 1 5d/2

This means that you can pick any difference you want (an even one presumably because you want integer ages).

Princess age: 4d

Prince age: 3d

Ages that work

Princess:

4

8

16

24

32

40

48

56

64

72

80

Prince:

3

6

12

18

24

30

36

42

48

54

60

*Did you answer this riddle correctly?*YES NO

## Missing Dollar Riddle

Three guests check into a hotel room. The clerk says the bill is $30, so each guest pays $10. Later the clerk realizes the bill should only be $25. To rectify this, he gives the bellhop $5 to return to the guests. On the way to the room, the bellhop realizes that he cannot divide the money equally. As the guests didn't know the total of the revised bill, the bellhop decides to just give each guest $1 and keep $2 for himself. Each guest got $1 back: so now each guest only paid $9; bringing the total paid to $27. The bellhop has $2. And $27 + $2 = $29 so, if the guests originally handed over $30, what happened to the remaining $1?

Hint: Make a list of all of the people involved and how much money they ended up with/spent.

The $9 paid by each guest accounts for the $2 that went to the bellhop. So rather than adding $27 to the $2 kept by the bellhop, the $27 accounts for the bellhops money. The $27 plus the $3 kept by the guests does add up to $30.

YES NO

*Did you answer this riddle correctly?*YES NO

## Rope Burn Riddle

You have two ropes. Each rope takes one hour to burn. These ropes are not identical, nor are they uniform; i.e. it does not necessarily take half an hour for half the rope to burn (if you have trouble visualizing this, imagine a rope of varying thickness across its length). With only these two ropes and a way to light them, how do you measure out 45 minutes?

Hint: You can light multiple ends and/or multiple ropes at the exact same time.

Light both ends of one rope, and only one end of the other rope. This will cause the first rope to burn out in 30 minutes. When the first rope burns out, there will be 30 minutes left on the second rope. So then, light the other end of the second rope, and the rest of it will burn out in 15 minutes. 30 + 15 = 45 minutes.

YES NO

*Did you answer this riddle correctly?*YES NO

## Intertwining Dimensions Riddle

More than just a double triangle, I intertwine the internal and external dimensions of God, Torah and Israel. What am I?

Hint:

## What Comes Next Riddle

Hint:

E. Each item is the first letter(s) of one of the seven continents:

1. Asia

2. North America

3. Africa

4. South America

5. Australia

6. Antarctica

7. Europe

YES NO

1. Asia

2. North America

3. Africa

4. South America

5. Australia

6. Antarctica

7. Europe

*Did you answer this riddle correctly?*YES NO

## I Smash Others Riddle

I tell you when to start,

Or remind if you forget.

I smash others to break them apart,

But Im pushed by another of me.

What am I?

Or remind if you forget.

I smash others to break them apart,

But Im pushed by another of me.

What am I?

Hint:

Cue. A cue tells you when to start, or if you forget your lines in a play. A cue ball is used to break at the beginning of a game of pool and the cue stick is used to push the cue ball on the break.

YES NO

*Did you answer this riddle correctly?*YES NO

## Moving Quarters Riddle

If you have two quarters on a table touching each other, how can you move one of the quarters without touching it? You are only allowed to touch one quarter but not move it. You can't touch the quarter that you move. You want to get at least enough room between the two quarters to insert another coin between the two quarters.

Hint:

Hold down one of the quarters very firmly. Take another coin and hit it against the quarter you are holding down. Tap hard enough to move the quarter next to it aside.

YES NO

*Did you answer this riddle correctly?*YES NO

## When I Turn Around Riddle

When I turn around once. What is out will not get in. When I turn around again. What is in will not get out. What might I be?

Hint:

## The More I Am Worth Riddle

Hint:

## A Ponderous House Riddle

I'm a riddle in nine syllables,

An elephant, a ponderous house,

A melon strolling on two tendrils O red fruit,

Ivory, fine timber!

The loaf's big with it's yeasty rising

Money's new minted in this fat purse.

I'm a means, a stage, a cow in calf.

I've eaten a bag of green apples

Boarded the train there's no getting off.

What am I?

An elephant, a ponderous house,

A melon strolling on two tendrils O red fruit,

Ivory, fine timber!

The loaf's big with it's yeasty rising

Money's new minted in this fat purse.

I'm a means, a stage, a cow in calf.

I've eaten a bag of green apples

Boarded the train there's no getting off.

What am I?

Hint:

## Post Your Hard Riddles Below

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