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A Big Pizza Pie

To get the most pizza, should you order two 12″ pizzas or one 18″ pie?

One 18″, with ~255 sumptuous square inches. Two 12″ pizzas would only give you ~226 square inches.

Note: The area of a circle is = πr2.

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A Voice With No Mouth

I am a voice without a mouth, throat or lungs. I know no language but speak in all tongues. What am I?

An echo.

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Rope Around The Earth

If a piece of rope was tightly wrapped around the earth and you added 3 feet to its length, how high could you uniformly raise it from the earth’s surface?

Just short of 6 inches.

Thanks to Nigel Coldwell for this one.

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Only Found In The Past

You will only ever find me in the past. I am created in the present but the future can never taint me. What am I?


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Rotating Coins Around Coins

You have two coins of equal size on a table, situated end to end vertically. If you roll the top coin around the bottom coin until it returns to its original position, how many times will it have rotated?

Twice. See this video for more details.

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Invisible Walls

What invention lets you look right through a wall?

A window.

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Rearrange the letters of each word in the phrase below to form a well-known saying.


Better Late Than Never

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Area, Death, Kick

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

Area, Death, Kick

Penalty. Penalty area, Death penalty, Penalty kick.

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The More You Run

The more you run, the harder I am to catch. What am I?

Your breath.

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Bank Wait Times

Suppose a small bank has one teller and customer transactions take 10 minutes on average. With 5.8 customers arriving per hour, what is the expected wait time? What would it be if you added a second teller?

With one teller, customers will wait nearly five hours on average. But adding a second teller makes the wait go down to 3 minutes.

Thanks to John D. Cook for this one.

Posted in Brain Teasers