777, 888 and 999

You are given the numbers 777, 888 and 999. Using the numbers once and adding, subtracting, multiplying or dividing, how can you make 999?

(7 x 7 x 7) + (9 x 9 x 8) + ((9 – 8) x 8) = 999
(77 + 7) + 888 + (9 + 9 + 9) = 999

If other operators were allowed, another solution would be 999 modulo (888 x 777). I’m sure there are more solutions.

Posted in Brain Teasers

Calm and Cool Among Tumult and Fury

I remain calm and cool among tumult and fury,
I hide treasures and creatures you could hardly fathom,
I will crush those I welcome in deeply,
I am dark yet beautiful.

What am I?

Underwater in the deep ocean. Even when storms brew, the water deep below the surface is calm and cool. Thousands of treasures have been lost in sunken ships, and amazing creatures live at deep depths of the ocean. At extreme depths, the pressure is crushing. It is extremely dark deep in the ocean, yet also beautiful.

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Next in the Sequence

Here is a series of numbers. What is the next number in the sequence?

1
11
21
1211
111221
312211

13112221

The next number in the series counts the previous numbers. Thus the first number is 1, which is one 1, or 11. To describe 11, you have two 1’s, or 21. Now you have one 2 and one 1, so the next number is 1211. The solution is to continue describing the previous number using only numbers.

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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

A Black Dog Sleeping

A black dog is sleeping in the middle of a black road that has no streetlights and there is no moon. A car coming down the road with its lights off steers around the dog. How did the driver know the dog was there?

It was daytime.

Posted in Riddles

Animal Kingdom Quiz

This is a four-part brain teaser.

1. How do you put a giraffe into a refrigerator?
2. How do you put an elephant into a refrigerator?
3. The Lion King is hosting an animal conference. All the animals attend except one. Which animal doesn’t attend?
4. There is a river you must cross but it is used by crocodiles and you don’t have a boat. How can you cross safely?

1. Open the refrigerator, put the giraffe in and close the door. It’s not complicated.
2. Open the refrigerator, take out the giraffe, then put in the elephant and close the door.
3. The elephant. He’s still in the refrigerator. After all, you just put him there.
4. Jump into the river and swim across. The crocodiles are at the Lion King’s animal meeting.
I admit, this is not a typical brain teaser, but it amused me.

Posted in Brain Teasers

Grow In Trees and Have No Teeth

I grow in trees, eat living things but have no teeth and give birth to something that looks nothing like me. What am I?

A bird. They are hatched and raised in trees (nests), don’t have teeth in the traditional meaning of teeth and they lay eggs, which look nothing like a bird.

A butterfly / caterpillar could also work.

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Sum of 22

Fill in numbers such that the sum of each 3-character row is 22 while the sum of all five numbers is 30.

a
bcd
e

The problem works out to a set of three equations:
b + c + d = 22
a + c + e = 22
a + b + c + d + e = 30

Solving for c = 14, leaving d = 8 – b and e = 8 – a. In other words, c must be 14, but the other two numbers just have to add up to 8. The requirement that they be unique rules out 4 + 4, so you’re left to choose from the following combations for b + d and a + e:
0 + 8
1 + 7
2 + 6
3 + 5

Posted in Brain Teasers

A Group of Three

I give you a group of three. One is sitting down, and will never get up. The second eats as much as is given to him, yet is always hungry. The third goes away and never returns.

Stove, fire, smoke.

Posted in Riddles

Important Rebus

What does this represent?

IMPORTANT = IMPORTANT

Equally important.

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