Riddles and Brain Teasers

Next in the Sequence

Here is a series of numbers. What is the next number in the sequence?

1
11
21
1211
111221
312211

13112221The next number in the series counts the previous numbers. Thus the first number is 1, which is one 1, or 11. To describe 11, you have two 1’s, or 21. Now you have one 2 and one 1, so the next number is 1211. The solution is to continue describing the previous number using only numbers.

13112221

The next number in the series counts the previous numbers. Thus the first number is 1, which is one 1, or 11. To describe 11, you have two 1’s, or 21. Now you have one 2 and one 1, so the next number is 1211. The solution is to continue describing the previous number using only numbers.

Posted in Brain Teasers

Tagged with sequence

Seven Letter Word with Ten Words

There is a seven-letter word in the English language that has ten total words without rearranging any of its letters.

What is the word?

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Therein

1. the
2. there
3. he
4. in
5. rein
6. her
7. here
8. ere
9. herein
10. therein

Posted in Brain Teasers

Colored Houses

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?

Show the answer »

Glass.

Posted in Brain Teasers

In the Sky But Also the Ground

I am in the sky but also in the ground. When you study me, no matter how long, I will always end with an f. I may be in your yard but not in your house. What am I?

Show the answer »

A leaf.

Posted in Riddles

All In White, A Fossil

All in white, a fossil,
fresh snow, a loan, the sky,
But just what am I?

Show the answer »

A bride (something old, something new, something borrowed, something blue).

Posted in Riddles

Tagged with What am I?

A Mile Long Train

A mile-long train is moving at sixty miles an hour when it reaches a mile-long tunnel. How long does it take the entire train to pass through the tunnel?

Show the answer »

Two minutes. The back of the train would be at the beginning of the tunnel after 1 minute, and would leave the end of the tunnel at the 2 minute mark.

Posted in Brain Teasers

ABCD equals DCBA

What 4-digit number abcd satisfies this equation?

4 × abcd = dcba

Show the answer »

2178

4 × 2178 = 8712

Posted in Brain Teasers

The Snooze Button

Why is it very common to have a 9 minute snooze interval on alarm clocks, why not 10 instead?

Show the answer »

By setting the snooze time to 9 minutes, the alarm clock only needs to watch the last digit of the time. So, if you hit snooze at 6.45, the alarm goes off again when the last digit equals 4. They couldn’t make it 10 minutes, otherwise the alarm would go off right away, or it would take more circuitry.

Posted in Brain Teasers

Five Pigeons on a Fence

Five pigeons are sitting on a fence. The farmer comes out and shoots one. How many are left?

Show the answer »

None, the rest flew away at the sound of the gunshot. Or one (the dead pigeon).

Posted in Brain Teasers

The Boat at High Tide

A boat has a ladder that has six rungs. Each rung is one foot apart. The bottom rung is one foot from the water. The tide rises at 12 inches every 15 minutes. High tide peaks in one hour.

When the tide is at its highest, how many rungs are under water?

Show the answer »

None. The boat is floating on the water, so as the tide rises, so does the ladder.

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