Not Seen Nor Felt

It cannot be seen, cannot be felt,
Cannot be heard, cannot be smelt.
It lies behind stars and under hills,
And empty holes it fills.
It comes first and follows after,
Ends life, kills laughter.

The darkness.

Posted in Riddles

What is the First Number of the Sequence?

If a number in a numeric sequence is 17 and the second number is 3, what is the first number?

I hesitated to add this because it’s poorly worded, ambiguous and the answer could be almost anything. I prefer teasers with a single answer, but there you go.

If you came up with a different answer and can explain how you did it, don’t think you’re wrong. It’s probably just as valid. Feel free to share yours in the comments.

My answer for the first number is 2.

Here’s how I got it.

The generic rule for a number in the sequence is: 2^(n – 1) + 1, where n is the position in the sequence.

Note: The teaser doesn’t specify the position of 17. In this case, it’s fifth.

Position 1: (so n = 1) is 2^(1 – 1) + 1 = 2

Position 2: 2^(2 – 1) + 1 = 3

Position 3: 2^(3 – 1) + 1 = 5

Position 4: 2^(4 – 1) + 1 = 9

Position 5: 2^(5 – 1) + 1 = 17

For the curious, the next 5 numbers of the sequence would be:

Position 6: 2^(6 – 1) + 1 = 33

Position 7: 2^(7 – 1) + 1 = 65

Position 8: 2^(8 – 1) + 1 = 129

Position 9: 2^(9 – 1) + 1 = 257

Position 10: 2^(10 – 1) + 1 = 513

Posted in Brain Teasers

Blow for Blow They Matched Each Other

Blow for blow,
they matched each other.
Neither would fall to the other.
In the eyes of the crowd,
they were this.

Equal.

By Sef Daystrom

Posted in Riddles
Tagged with

Glittering Points Downward Thrust

Glittering points
That downward thrust,
Sparkling spears
That never rust.

An icicle.

Posted in Riddles

What Kind of Nut Has a Hole?

What kind of a nut has a hole?

A donut (or a nut as in a nut and bolt). Here’s a fun fact. Another riddle with donut as the answer is, “What has no beginning, end or middle?”

Posted in Riddles

Ted and The Vicious Dog

Ted was lost while driving around the country and saw a house. He parked under a nearby tree and started toward the house. As soon as he got out of his car a huge dog lunged at him from the opposite side of the tree. Fortunately the dog was chained and Ted managed to stay out of reach. Finding no one home at the house, Ted returned to his car, but as he approached the dog lunged at him again. The chain was so long the snarling animal could reach both car doors. How did Ted escape the dog and get back into his car?

Ted moved slowly around the tree keeping just out of the dog’s reach. The animal followed, winding its chain around the tree until it was too short to reach Ted’s car

Posted in Brain Teasers

Turn Into a Car, Building or Robot

I can turn into a car, building or even a robot. I’m man made and my siblings and I outnumber you sixty-two to one. My name means, “Play well” in my creator’s native tongue. What am I?

Legos. They can be turned into all sorts of things, including cars, building and robots. If you divided up all the legos ever made, each person on the planet would get 62. Lego is based on the Danish phrase leg godt which means, “play well”.

Posted in Riddles

What is the center of gravity?

What is the center of gravity?

V. The letter ‘v’ is the center of the word gravity.

Posted in Riddles

Only At Rest Do They Touch the Ground

Two legs I have and this will confound, only at rest do they touch the ground. What am I?

A wheelbarrow.

Posted in Riddles
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What Digit Does Each Letter Represent?

This is what you know:

1. Each letter represents a different digit from 1 to 9
2. The total of each row is 17.
3. (B × B) + B + F = A
4. C × F = EF (a 2-digit number, not their product)

A B C
D E F

What digit does each letter represent?

A = 7
B = 1
C = 9

D = 8
E = 4
F = 5

A + B + C = 17
D + E + F = 17
B2 + B + F = A
C × F = EF

To begin with, B has to be a 1 or 2 or else A wouldn’t be a single digit. Plug in B = 2, gives you 6 + F = A, meaning F and A can only be (1,7) or (3,9). To get 17, C would have to be 8 or 6, but those values don’t work for C × F = EF. So B must be 1.

2 + F = A means F and A can be (2,4), (3,5), (4,6), (5,7), (6,8) or (7,9). To get 17 on the top row, the only option that leaves C as a single digit is F = 5 and A = 7.

C × F = EF
9 × 5 = 45, so E = 4 and D = 8 to make the second row equal to 17.

Posted in Brain Teasers