Riddles and Brain Teasers

A red-house is made of red bricks, has a red wooden door and a red roof. A yellow-house is made of yellow bricks, has a yellow wooden door and a yellow roof. What is a green-house made of?

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Glass.

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 = ?

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

transpose_digits() just swaps the digits

Posted in Brain Teasers

A NA A SA A

A NA A SA A A

What comes next in the series?

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E. Each item is the first letter(s) of one of the seven continents:

1. Asia
2. North America
3. Africa
4. South America
5. Australia
6. Antarctica
7. Europe

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Tagged with Series

Lighter Than Air

I’m lighter than air but a million men can’t lift me. What am I?

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A bubble.

Posted in Riddles

Fewest Queens For Full Attack

What is the smallest number of queens required on a chess board to attack all squares?

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5. To see where they need to be placed, check out the diagram on Wolfram’s Queens Problem page.

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What Do You Serve?

What do you serve that a polite recipient would immediately send back?

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A ball, when you’re playing tennis, volleyball, table tennis, etc.

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