The Potato Paradox

Fred brings home 100 pounds of potatoes, which (being purely mathematical potatoes) consist of 99 percent water. He then leaves them outside overnight so that they consist of 98 percent water. What is their new weight?

50 pounds.

100 lb of potatoes with 99% water weight means there’s 99 lb of water and 1 lb of solids, a 1:99 ratio.

If the water decreases to 98%, then the solids account for 2% of the weight. The 2:98 ratio reduces to 1:49. Since the solids still weigh 1 lb, the water must weigh 49 lb for a total of 50 lbs for the answer.

Read more at the Potato Paradox wikipedia page.

Posted in Brain Teasers

I Can Always Go Up, Never Down

I can always go up, never down,
I can always turn left, never right,
I am always hot when I’m cold

A ski lift.

Posted in Riddles

Twice Four and Twenty Blackbirds

Twice four and twenty blackbirds sitting in the rain.
I shot and killed a quarter of them. How many do remain?

After shooting a quarter of the birds, the rest would fly off, so the remaining birds, brutally shot by you, would be:

(2 × (4 + 20)) / 4 = 12

Posted in Brain Teasers

I Can Kill People

I can kill people, or cause great pain.
You eat me.
I can mean you’re crazy.
I hold things together.
I help climbers stay safe.
I can replace a swear.
And I’m on a violin.

What am I?

Nuts.

People with nut allergies can die from eating nuts. Being hit in the nuts hurts (I speak from experience. Painful, painful experience). You eat nuts (unless you’re allergic, in which case you should run away). If someone says you’re nuts, it doesn’t mean you’re a peanut or an almond. Nuts and bolts hold things together. A climber’s nut or chock wedges into a rock. Instead of swearing, you can say, “Aww nuts!”. And finally, the nut on a violin is a small piece of hard material that supports the strings.

Posted in Riddles
Tagged with

A Neighborly Argument

Two of your neighbors were arguing about if the first man’s peacock laid an egg in the seconds man’s garden, who would own the egg. They asked you to solve their dilemma. What would you tell them?

Peahens lay eggs. Peacocks are males.

Posted in Brain Teasers

How to Make the Great Escape

Shawn and Kyle are bunk mates in prison and are desperate to escape. There is an unbarred window high above them, but the walls are smooth and it’s too high for them to reach even when standing on each other’s shoulders. Their cell has no furnishings other than a toilet and even when standing on the toilet and each other’s shoulders, they can’t reach the window.

They’ve tried digging through the dirt floor but the wall extends 50 feet below. How could escape through the window?

Smurf imprisoned

They could dig down with their hands, but it would take too long to dig 50 feet down. Instead, they could pile the dirt they dig up to give them enough height to reach the window. If they put the toilet seat down, they could pile the dirt on top, then get on each other’s shoulders to reach the window. That would mean only one of them would be able to get out. The remaining prisoner could either continue piling dirt to account for the missing guy or the escaped prisoner could come back with a rope to help his mate escape.

Posted in Brain Teasers

Five Items In a Tennis Court

We’re five little items of an everyday sort. You’ll find us all in a tennis court. What are we?

The vowels. The phrase “a tennis court” contains all five vowels sorted in alphabetic order: a, e, i, o, u.

Posted in Riddles

A House With No Doors

I am in a house with no doors. There are people inside but give no reply. Who am I?

A fish. A fish bowl or aquarium is the fish’s house and the people inside are the decorative divers that offer no reply (one might ask how the fish knows, given that they aren’t a talkative bunch themselves).

Posted in Riddles

I Am And Yet Cannot

I am and yet cannot,
I’m an idea, yet can rot,
I’m two but none,
On land but on sea.

What am I?

A paradox / pair of docks.

Posted in Riddles

The Cost of Household Hardware

A man went to the hardware store to buy items for his house.

1 would cost $.25
12 would cost $.50
122 would cost $.75

When he left the store he had spent $.75, what did he buy?

House numbers.

Posted in Riddles