Lending Money to Darlene

Franklin lent Darlene as much money as she already had, then she spent $10. The next day, Franklin lent her as much money as she now had and again, she spent $10. On the third day Franklin once again lent her as much money as she now had and she spent $10, leaving her broke. How much money did Darlene start with?

$8.75
You may have been tempted to guess $30 because $10 is spent three times, but that would mean she would have had $60 ($30 lent plus the $30 she already had), and $50 after spending $10. The rest of the numbers end up at higher than zero, so we know it has to be less than $30. Even starting at $10 leaves Darlene with $10 on the third day. Starting with $8.75 works out as follows.

Day 1: $8.75 (lent) + $8.75 (already had) – $10 (spent) = $7.50 (remaining)
Day 2: $7.50 + $7.50 – $10 = $5
Day 3: $5 + $5 – $10 = $0

Posted in Brain Teasers

Death By Marbles

You are a prisoner sentenced to death. The Emperor offers you a chance to live by playing a simple game. He gives you 50 black marbles, 50 white marbles and 2 empty bowls and instructs you to divide the 100 marbles into the two bowls. You can divide them however you want as long as all the marbles are in the bowls. You will be blindfolded and the bowls and marbles will be thoroughly mixed. You will then choose a single marble from one of the bowls. If the marble is white, you live. Black and you will be put to death.

How do you divide the marbles up so that you have the greatest probability of choosing a white marble?

Place one white marble in one bowl and place the rest of the marbles in the other bowl (49 whites, and 50 blacks).

This way you begin with a 50/50 chance of choosing the bowl with one white marble and living. Even if you choose the other bowl, you still have an almost 50% chance of picking one of the 49 white marbles. There are no guarantees in life, but this gives you the best change of surviving.

Posted in Brain Teasers

Forward I’m Heavy

Forward I’m heavy, but backwards I’m not. What am I?

Ton.

Posted in Riddles

Greater Than God

It is greater than God and more evil than the devil. The poor have it, the rich need it and if you eat it you’ll die. What is it?

Nothing. Nothing is greater than God, nothing is more evil than the devil, the poor have nothing, the rich need nothing and if you eat nothing you’ll die.

Posted in Riddles

Worn By Men For Privacy

I’m an argument of why my side should win,
And worn by men for privacy.
I don’t last long if I get under your skin,
And I rhyme with a kind of misery.

What am I?

Brief (or briefs). A legal brief is a short outline of the arguments in a court case, briefs are worn by men to cover their privates. Brief also means to not last long and brief rhymes with grief, a kind of misery.

Posted in Riddles
Tagged with

The Bookworm

A bookworm eats from the first page of an encyclopedia to the last page in a straight line. The encyclopedia consists of ten 1000-page volumes and is sitting on a bookshelf in the usual order. Not counting covers, title pages, etc., how many pages does the bookworm eat through?

        __                             __
      B|  |                           |  |F
      A|1 |...........................|10|R
      C|  |                           |  |O
      K|  |                           |  |N
       |__|                           |__|T
      -------------------------------------

On a book shelf the first page of the first volume is on the “inside”, so the bookworm eats only through the cover of the first volume, then 8 times 1000 pages of Volumes 2 – 9, then through the cover to the 1st page of Vol 10 for a total of 8,000 pages.

Note: The question asks how many pages, not how many sheets of paper.

Posted in Brain Teasers

One By One We Fall From Heaven

I can be long, or I can be short.
I can be grown, and I can be bought.
I can be painted, or left bare.
I can be round, or square.
What am I?

Sands in an hourglass.

Posted in Riddles

Word Pairs to Create a New Word

One letter can be used to replace the first letter of each word pair below to create two new English words. The new letters can then be combined to spell a word. What is that word?

MAIL ____ PINK
CART ____ SAID
GRID ____ RIMLESS
LINK ____ BOUND
ROWED ____ RIPPLE

SMART

SAIL – SINK
MART – MAID
ARID – AIMLESS
RINK – ROUND
TOWED – TIPPLE

Posted in Brain Teasers

Swallowed the Dead

I’ve swallowed the dead,
Of a torn land’s end.
And I hold the remains,
Of an unknown friend

A mansion once stood,
Where I now lay,
We honor all those
Who gave us today.

What am I?

Arlington National Cemetery, the burial place of soldiers from the United States Civil War. It also houses the tomb of unknown soldiers. General Robert E. Lee’s mansion once stood on the land that is now occupied by the cemetery. And on Memorial Day in the US, we honor all those who died while serving their country’s armed forces.

Posted in Riddles
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Border Plane Crash

A plane crashed on the border or US and Canada. Where do they bury the survivors?

Nowhere, you don’t bury survivors.

Posted in Brain Teasers