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

The Beggar’s Brother

A beggar’s brother went out to sea and drowned.
But the drowned man had no brother.
What was the relationship between the man who drowned and the beggar?

The beggar was his sister.

Posted in Brain Teasers

Lighter Than What I’m Made Of

Lighter than what
I am made of,
More of me is hidden
Than is seen.

An Iceberg.

Posted in Riddles

Part Of The Bird

The part of the bird
that is not in the sky,
which can swim in the ocean
and always stay dry.

What is it?

The bird’s shadow.

Posted in Riddles

Only Self-Enumerating Number

What is the only self-enumerating number in English?

Four. The number four has four letters, making it self-enumerating. Interestingly, there are no self-enumerating numbers in French.

Posted in Brain Teasers

Answer This Honestly

What question can you never honestly answer yes to?

Are you asleep? (or dead, or conscious, or being silent).

Posted in Riddles

The Person Who Makes It Sells It

The person who makes it, sells it.
The person who buys it never uses it.
The person who uses it doesn’t know it.

What is it?

A coffin.

Posted in Riddles

What Is The Longest Word With Horizontal Symmetry

A word with horizontal symmetry is one whose letters are a mirror image of themselves. If you drew a horizontal line across the word and folded it over, it would overlap on itself. For example, EXCEEDED and ICEBOX have horizontal symmetry, but VERTICAL and SIMPLE do not.

What is the longest word with horizontal symmetry?

CHECKBOOK.

Posted in Brain Teasers

Twice As Many Women As Children

At a party of thirty-five people there are twice as many women as children and twice as many children as men. How many of each are there?

20 women, 10 children and 5 men.

To figure it out, let m be the number of men and you get this equation:

4m + 2m + m = 35
7m = 35
m = 35 ÷ 7
m = 5

Posted in Brain Teasers

Four Legs But No Tail

I have four legs but no tail. Usually I am heard only at night. What am I?

A frog. The frog is an amphibian in the order Anura (meaning “tail-less”) and usually makes noises at night during its mating season.

Posted in Riddles