Four Nines To Make a Hundred

How can you make four 9’s equal 100?

99 9/9 = 100

Posted in Brain Teasers

Cowboy Corral

Two cowboys live next door to each other and both have a corral for their cows in the back. One day they meet at the back of their homes, standing next to a wall dividing their corrals. The first cowboy gets to thinking and asks his neighbor for a cow so he can double his herd. The other cowboys replies, “That’s fine by me partner, cuz then we’ll have the same number of cows?” How many cows does each cowboy own?

We’ll use A to represent the first cowboy and B for the second cowboy.

A + 1 = 2A, so A = 1.
A + 1 = B – 1, so B = 3.

Posted in Brain Teasers

Least Sleepy Month

In what month do people sleep the least?

February, because there are fewer days.

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Seemingly Simple Math

What is the answer to this math problem:

8 ÷ 2 (2 + 2)

16 or 1, depending.

According to PEMDAS, parentheses come first: 8 ÷ 2 (4)

Then, even though multiplication is first in PEMDAS, you go left to right: 4 (4) = 16

If you got 1, you’re in good company. That’s what I got at first too but most calculators I’ve tried get 16.

I found this at Popular Mechanics and the debate continues online.

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

I’m Told and Make You Crazy

I can be told and can make you crazy,
Most people don’t like me and think I’m harmful.

What am I?

A lie. Lies are told, can make people crazy with rage, and most people don’t like to have lies told to them. Lies can’t be harmful though. :) (See what I did there?)

Posted in Riddles

Decorating With Tiles

You are decorating for spring and you’ve found a bargain. A huge box of beautifully decorated tiles, enough to provide a border in two rooms. You really can’t figure out how to arrange them. If you set a border of two tiles all around, there’s one left over. If you set three tiles all around or four or five or six there’s still one tile left over. Finally you try a block of seven tiles for each corner and you come out even. What is the smallest number of tiles you could have to get this result?

301. This is the smallest number that even divides by 7, but when divided by 2, 3, 4, 5, and 6 gives you one left over.

Posted in Brain Teasers

TOWN Rebus

What does this represent?

T
O
W
N

Downtown.

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Go Back!

Go back. You must strive to find a way to stay alive. What is 4+uo.5?

South. If you read the letters from back to front they make 5.ou+4, or south.

Posted in Brain Teasers

I Live In A Busy Place In The City

I live in a busy place in the city,
I’ll let you stay with me for awhile,
If you don’t feed me, I can get you into trouble.

What am I?

A parking meter.

Posted in Riddles