What Goes In the Water Red?

What goes in the water red
And comes out black?

Iron

Posted in Riddles

An Apparition

Two people were in a house. No one came in or went out, but then there were three people. What happened?

The two people were a husband and an expectant wife, who gave birth to her baby.

Posted in Brain Teasers

The Long River

How many times does the letter S appear in the name of the longest river in the world?

Zero. The Nile is the longest river in the world. Some claim the Amazon as the longest, but that too has no “S”es (that looks weird but I don’t know how else to write the plural of “s”). The Mississippi is the 4th largest river in the world according to a href=”https://en.wikipedia.org/wiki/List_of_rivers_by_length”>Wikipedia.

Posted in Riddles

I Wave But Never Say Goodbye

I wave my hands at you,
But I never say goodbye.

You’re always cool with me,
Even cooler when I’m high.

What am I?

An electric fan

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Letters, Letters, What Comes Next?

What letter comes next letter in this series?

A E F H I ___

K. It’s the series of capital letters without curves in alphabetical order.

Posted in Brain Teasers

I Can Cry Without Eyes

I can cry but I have no eyes.
I can fly but I have no wings.
Wherever I go, darkness follows me.

What am I?

A cloud. Crying is rain, they fly in the sky and darkness follows because they block the sun.

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Nine Matchbox Sticks To Ten

I have nine matchbox sticks and would like to make ten. How do I do it?

Arrange the nine matchbox sticks like so to make the shape of the number ten:

        _
    /| | |
     | |_|
Posted in Brain Teasers

Sixteen, Twenty-six, Then What?

Fill in the missing numbers in this number series.

16, 26, ?, 43, 50, ?, 61, 65, ?, 70, 71

The method to create the series is start by adding 10, then decrease the addend by 1 for each new number in the sequence. That gives us:

16 + 10 = 26
26 + 9 = 35
35 + 8 = 43
43 + 7 = 50
50 + 6 = 56
56 + 5 = 61
61 + 4 = 65
65 + 3 = 68
68 + 2 = 70
70 + 1 = 71

Posted in Brain Teasers

Mysterious Math

This problem can be solved by preschool children in five to ten minutes, by programmers in an hour and by people with higher education…well, check it yourself.

8809 = 6
7111 = 0
2172 = 0
6666 = 4
1111 = 0
3213 = 0
7662 = 2
9313 = 1
0000 = 4
2222 = 0
3333 = 0
5555 = 0
8193 = 3
8096 = 5
1012 = 1
7777 = 0
9999 = 4
7756 = 1
6855 = 3
9881 = 5
5531 = 0
2581 = ?

What is the missing number and why?

Two. The number is how many closed circles there are in the 4 digits. 0, 6 and 9 each have one, 8 has 2.

Posted in Brain Teasers

Halo of Water, Tongue of Wood

Halo of water, tongue of wood
Skin of stone, long I’ve stood.
My fingers short reach to the sky
Inside my heart men live and die.

A castle.

Posted in Riddles