Balance Twelve Eggs

Suppose you have twelve eggs and a balance scale. All of the eggs are identical except for one whose only difference is its weight. Using the scale only three times, determine which egg is the odd egg out and whether it is heavier or lighter than the other eggs.

Weigh four against four. If they’re equal, weigh three of them against three you haven’t weighed. If they balance too, weigh the last remaining egg against any of the others to see if it is lighter or heavier. If the three suspects are heavier, weigh one of them against another and the one that goes down is it. If they balance the remaining suspect is heavy. Use the same process if they’re lighter. If the initial four vs four don’t balance, weigh two heavy eggs and a light egg against one heavy egg, one light one and a known normal egg. If they balance weigh the remaining two light eggs against each other. If they balance the unweighed heavy egg is the odd one out. If the side with two heavy eggs goes down weigh them against each other. If they balance it is the light egg on the other side. If the other side goes down it is either because of one heavy egg on that side or because the one light egg on the other side is lighter than the rest. Weigh one of them against a known normal egg to determine which is true.

Posted in Brain Teasers

I Turn Around Once

I turn around once,
What is out will not get in.
I turn around again.
What is in will not get out.

What am I?

A key.

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Hickory Dickory Dock

Hickory dickory dock!
The mouse ran up the clock.
The clock struck one
and down I come.
The man will never talk.

What am I?

A guillotine.

Posted in Riddles

Doesn’t Fly Even With Wings

I have four wings but cannot fly,
I’ve never laughed nor will ever cry,
As much as I’d love to leave the ground,
I toil away with nary a sound.

What am I?

A few windmills

A windmill. The typical windmill, like the ones Don Quixote chased, have four vanes or sails. You might even say they look like wings. Windmills don’t have emotions, so they can’t laugh or cry. And since they don’t have actual wings, windmills don’t get off the ground. A well-oiled little bugger won’t make a peep.

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Soldiers Line Up Spaced With Pride

Soldiers line up, spaced with pride,
Two long rows lined side by side,
One sole unit can decide,
If the rows will unite or divide.

What am I?

A zipper.

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Oh, Oh, Oh, No

What number do the three letters O, H and N represent in order to make this addition problem correct?

OH
OH
OH
OH +
-----
NO

O = 2
H = 3
N = 9

23
23
23
23 +
-----
92
Posted in Brain Teasers

Harvest Though No Grain

I harvest you, though you’ve no grain,
I reap you in the wind and rain,
You bleed not but your soft meat
And nectar makes a sweetest treat.
What am I?

A clam or oyster. You harvest clams or oysters on the beach or go diving, and the beach is often windy and rainy. Neither bleeds but are known for having, soft, slimy meat, and people often drink the “clam nectar” or “oyster juice”.

Thanks to Helena for this submission

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To Protect Our King From A Foe’s Attack

The eight of us go forth not back to protect our king from a foe’s attack. What are we?

Pawns in a chess game. There are eight pawns and they are only permitted to move forward, not backward and the primary objective in chess is to protect the king.

Posted in Riddles

Finding Rhymes in Categories

Find rhymes for each set of words so the first is a category and the rest are items in the category.

For example, LOYALTY: spring, clean, rinse → ROYALTY: king, queen, prince

1. LOIN: mortar, climb, pickle
2. SQUISH: famine, search, doubt
3. GILDING: radium, Bose, hassle
4. THYME: surgery, girder, scrutiny

1. COIN: quarter, dime, nickel
2. FISH: salmon, perch, trout
3. BUILDING: stadium, mosque, castle
4. CRIME: perjury, murder, mutiny

Posted in Brain Teasers

Planting Trees on Arbor Day

On Arbor Day the fourth grade class began planting trees. They finished planting five trees before the fifth grade class arrived. But they accidentally planted them on the fifth grade side of the street.

The fourth-graders crossed the street to start over, and the fifth-graders planted the remaining trees. They finished first and felt bad for the fourth-graders, so they crossed the street and planted five trees. They planted another five trees at which point all of the trees had been planted.

By how many trees were the fifth-graders ahead of the fourth-graders?

Ten. The fifth-graders planted five more trees than they were assigned, and the fourth-graders planted five fewer than their assignment.

Posted in Brain Teasers