Subscribe via feed.

Complete the sequences

Posted by Karys under Tom (1 Respond)

I) 1, 2, 2, 3, 2, 4, 2, 4, 3, 4, 2, …
II) 1, 2, 4, 8, 16, 31, … (not 32)
III) 1, 25, 23, 13, 3, 14, 15, 16, 8, …

Even rows

Posted by Karys under Tom (5 Responds)

In a 6×6 grid of crosses :

x x x x x x
x x x x x x
x x x x x x
x x x x x x
x x x x x x
x x x x x x

1) Remove 6 xs, so that in each column and each row has an even number of xs. Try removing 8 xs instead of 6.

2) How many such possible combinations are there ?

The Speed Of Light

Posted by TheWyvern under SharedPuzzle (11 Responds)

how could we measure the speed of light from holy book (Any holy book .i.e. the holy qur’an – the bible …etc)..but the proof from within it’s verses ..?! of course the Proof will mainly depend on scientific explanation to get the speed of light .

See if you can follow this…

Posted by Karl Sharman under Tom (14 Responds)

What is the 5-digit number in which the sum of the first two digits is one smaller than the third, the third is double the fourth, the fourth is double the last, the third is the product of the fourth and fifth, the second is five more than the first, and the first is one-eighth the third and also one-fourth of the fourth?



Posted by Karl Sharman under Tom (4 Responds)

Can you decode the following well known saying. Each encoded letter represents more than one real letter:


Roary, the racing car

Posted by Karl Sharman under Tom (23 Responds)

During his career as a Formula 1 racing car, Roary managed to complete a lap at Silver Hatch Race-track with an average speed of 150 mph. He managed to complete the first two fifths of the lap length at a speed of 123 mph and the second two fifths of the lap length at a speed of 164 mph. At what speed was the final one fifth of the lap length covered?


Easy, Basic Maths

Posted by Karl Sharman under Tom (15 Responds)

Two x Two = Three
Can you make this work?


Binary Question

Posted by Karl Sharman under Tom (8 Responds)

Heres a simple bit of binary code…. translate back into english, and answer the question…

Unsurprisingly, I’m giving no hints at this stage, and I’ve removed spaces and punctuation, except the question mark.


Oh, alright, z=11010… is that enough help?


Petals Around the Rose

Posted by Locke under Logic, Tom (26 Responds)

The name of the game is Petals Around the Rose, and that name is significant. Newcomers to the game can be told that much. They can also be told that every answer is zero or an even number. They can also be told the answer for every throw of the dice that are used in the game. And that’s all the information they get.

The person who has the dice and knows the game, rolls five dice and remarks almost instantly on the answer. For example: in Roll #1 the answer is two.

Roll #1.

4 1 6 3 6

“The answer is what?” says the new player.


“On that roll?”


“Would it still be two if I moved the dice without turning any of them over, just rearranging the pattern?”

“I can tell you only three things: the name of the game, the fact that the answer is always even, and the answer for any particular throw. In this case the answer is two.”

“So that’s how it is. What am I supposed to do?”

“You’re supposed to tell me the answer before I tell you. I’ll give you all the time you want, but don’t tell me your theory, just the answer. If you figure it out, you don’t want to give the idea away to these other jokers around you. Make them work for the answers, too. If you get the answer right on six successive rolls, I’ll take that as prima facie evidence that you understand the game.”

“OK, roll again.”

Roll #2.

5 6 5 4 4

“I give up. What’s the answer?”

“The answer is eight.”

“Roll again.”

Roll #3.

3 5 5 5 6
The answer is fourteen.

Roll #4.

2 6 2 1 4
The answer is zero.

Roll #5.

4 3 2 1 3
The answer is four.

Roll #6.

6 5 6 2 2

What is the answer for roll #6?

Weigh an elephant

Posted by Karys under Tom (27 Responds)

There is a chinese short story telling about a minister (or whatever) who weighs the Emperor’s elephant.

How could he have done that, without having to make any giant weighing machine ?

You are not specifically asked to find the story where this came from. Here, originality and practicability are the key.