Which Do You Light First?

You have a single match and are in a pitch black room with a candle, an oil lamp and a gas stove. Which do you light first?

The match.

Posted in Brain Teasers

Five Three Two

What is the answer to the last equation?

5 3 2 = 151012
9 2 4 = 183662
8 6 3 = 482466
5 4 5 = 202504
7 2 5 = ?

10000 × (x × y) + 100 × (x × z) + transpose_digits(x × y + y × z)

transpose_digits() just swaps the digits

Posted in Brain Teasers

Three Digits in a Row

On a regular 12-hour digital clock how many times would the same three digits in a row be displayed (e.g. 1:11, 11:12, 12:22) in one day?

34 times. These 17 instances will be visible twice in a 24 hour period.

1:11
2:22
3:33
4:44
5:55
10:00
11:10
11:11
11:12
11:13
11:14
11:15
11:16
11:17
11:18
11:19
12:22

Posted in Brain Teasers

The Color of Clouds

First, think of the color of clouds. Next think of the color of snow. Last, think of the color of the moon. Now, what do cows drink?

Water. If the teaser worked, you guessed milk.

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

Measures Out Time

I measure out time,
Until in time,
All is smashed into me.

What am I?

Sand

Posted in Riddles
Tagged with

Wear Black

What does this represent?

Wear
Black

Black underwear.

Posted in Riddles

Bed, Evil, Identical

What word can be added before or after these words to make a new word or phrase?

Bed, Evil, Identical

Twin. Twin bed, Evil twin, Identical twin.

Posted in Riddles

What is the Five Digit Number?

What 5-digit number satisfies the following requirements?

1. No zeroes
2. First two digits are the same
3. Fourth digit is twice the first
4. Last digit is twice the third
5. Sum of all digits is 18

33264.

There are several ways of solving this. One way is to represent each spot with a letter, A – E.

Then you have these equations:

A = B
D = 2 * A
E = 2 * C
A + B + C + D + E = 18

By simplifying, you get:

4 * A + 3 * C = 18

Plug in values for A and C to find that A = 3 C = 2.

Posted in Brain Teasers

The Tail of a Dragon

What animal can be created from the head of a lamb, the body of a pig, the hind quarters of a buffalo and the tail of a dragon?

A lion.

Head of a lamb = L
Body of a pig = I
Hind quarters of a buffalo = O
Tail of a dragon = N

Posted in Brain Teasers