Ancient Arabic

I’m Arabic, but if you speak English, you probably use me every day.

What am I?

The Arabic numerals, 1, 2, 3, etc.

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1 2 3 4 5 6 7 8 9 = 100

This equation is incomplete: 1 2 3 4 5 6 7 8 9 = 100

One way to make it accurate is by adding seven plus and minus signs, like so.

1 + 2 + 3 – 4 + 5 + 6 + 78 + 9 = 100

How can you do it using only 3 plus or minus signs?

123 – 45 – 67 + 89 = 100

Posted in Brain Teasers

I Move Quickly

Physicists have built devices to make me move quickly. My last eight letters can be commonly found in newspapers, magazines, and journals.

What am I?

Particles. Physicists use particle accelerators and newspapers, magazines and journals have articles.

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Six Apples

A mother of three children had six apples. She gave two to each and yet 4 remained. How was this possible?

She gave the same 2 apples to each child in succession.

Posted in Brain Teasers

Commonly Forgotten And Sometimes Rotten

I am always with you
But commonly forgotten.
You use me constantly,
And can sometimes be rotten.

What am I?

Air.

Posted in Riddles

You Read Me Daily

I am a seven letter word, you read me daily. Letters 567 increase every year. The third and fourth letters are the same and my 325 letters cover about 70% of the world. What am I?

message. Letters 567 are your age, which goes up every year. Letters 3 and 4 (both s) are in fact the same, and letters 325 spell sea, and estimates say that the earth is covered by about 70% water.

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What is the Chance That You’ll Be Correct?

If you choose an answer to this question at random, what is the chance that you will be correct?

a) 25%
b) 50%
c) 60%
d) 25%

This is becomes a self-referential paradox. Both A and D would be correct if there were four unique answers, but since A and D are the same answer, the chance that you would choose a correct answer is 50%, which makes B correct. But if there’s only one correct answer, the odds of choosing the correct one at random goes back to 25%. And around and round you go.

There’s a lot of discussion at Richard Wiseman’s blog and more at Lifehacker, where I first saw this.

Posted in Brain Teasers

The Roast with the Most

How do you spell roast?
How do you spell most?
How do you spell coast?
How do you spell post?

What do you put into a toaster?

Bread. (It turns into toast when it’s done toasting).

Posted in Brain Teasers

A Group of Three

I give you a group of three. One is sitting down, and will never get up. The second eats as much as is given to him, yet is always hungry. The third goes away and never returns.

Stove, fire, smoke.

Posted in Riddles

Come For a Ride

I go up, but at the same time go down,
Up toward the sky and down toward the ground,
I’m present tense and past tense too,
Come for a ride, just me and you.

What am I?

A see-saw.

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