Weighty Wine

How much does a bottle of wine weigh if it is 1 kilogram plus half its own weight?

2 kg.

If we let half of the bottle’s weight be “n”, then we get the following equation: n/2 + 1kg = n (the bottle’s weight).

Solve for n:
n/2 + 1 = n
1 = n/2
2 = n

Posted in Brain Teasers

A Shorter Word

What word becomes shorter when you add letters to it?

Short. Adding ‘er’ to short gives you shorter.

Posted in Riddles

If You Break Me, I Don’t Stop Working

If you break me
I do not stop working,
If you touch me
I may be snared,
If you lose me
Nothing will matter.

Your heart.

Posted in Riddles

What Can Lift Objects

What can lift objects
or hopelessly try,
but only when filled,
or, lifeless, it lies?

A glove.

By Sef Daystrom

Posted in Riddles

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

Cornelius and the Flat Tire

Cornelius got a flat tire on a miserable, rainy day. As he was changing it on the side of the road, he placed the four lug nuts in the overturned hub cap. As our dear friend was moving back to put on the spare, he accidentally bumped the hub cap. He watched helplessly as all four lug nuts rolled into a deep sewer and were whisked away. Then our friend had a brilliant solution and within minutes was driving safely away.

What was his solution?

He removed one lug nut from each of the other 3 tires and used them to secure the spare tire, then drove to a tire shop.

Posted in Brain Teasers

Leaves That Don’t Fall

I have wood but no bark,
And leaves that don’t fall,
I am made up of branches,
and come in sizes of all.

I am completely devoured many times,
over and over by a worm of a kind.
If you want to know the answer of mine,
look for the secret that I’ve stored inside.

What am I?

A library or bookstore.

Posted in Riddles
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A Neck and No Head

What has a neck and no head, two arms but no hands?

A shirt (or sweater, jacket, etc).

Posted in Riddles

Four Gallons From Two Buckets

You have two buckets. One holds exactly five gallons and the other three gallons. How can you measure exactly four gallons of water into the five gallon bucket?

Assume you have an unlimited supply of water and that there are no measurement markings of any kind on the buckets.

  1. Fill the 3-gallon bucket.
  2. Pour the 3 gallons of water into the 5-gallon bucket
  3. Fill the 3-gallon bucket again.
  4. Fill up the 5-gallon bucket with the 3-gallon bucket, leaving you with 1 gallon left in the 3-gallon bucket.
  5. Empty out the 5-gallon bucket.
  6. Pour the remaining 1 gallon of water from the 3-gallon bucket into the 5-gallon bucket.
  7. Fill the 3-gallon bucket.
  8. Pour the 3 gallons of water from the 3-gallon bucket into the 5-gallon bucket leaving you with 4 gallons of water in the 5-gallon bucket.

Alternate solution:

  1. Fill up the 5 gallon bucket
  2. Pour it into 3 gallon bucket, leaving 2 gallons
  3. Empty out the 3 gallon bucket
  4. Pour the 2 gallons in the 5 gallon bucket into the 3 gallon bucket
  5. Fill up the 5 gallon bucket and pour it into the 3 gallon bucket until it’s full, leaving 4 gallons in the 5 gallon bucket.
Posted in Brain Teasers

Old Mother Twitchet Had One Eye

Old Mother Twitchet had one eye
and a long tail that she let fly.
And every time she went through a gap,
she left some tail in the trap

A needle and thread.

Posted in Riddles