Midway Numbers

Select the number that is midway between the lowest number and the highest number.
Which number is midway between that number and the number that is nearest the highest number?

35  5 52 36 67
69  4 51 37 71
55 68  3 53 39

53.

37 is midway between 3 (the lowest number) and 71 (the highest number).
53 is midway between 37 and 69 (nearest to the highest number).

Posted in Brain Teasers

Ten Plus Ten Equals Ten

When can ten plus ten equal ten, yet ten minus ten equal twenty?

When putting gloves on then removing them.

Posted in Brain Teasers

What is the Chance That You’ll Be Correct?

If you choose an answer to this question at random, what is the chance that you will be correct?

a) 25%
b) 50%
c) 60%
d) 25%

This is becomes a self-referential paradox. Both A and D would be correct if there were four unique answers, but since A and D are the same answer, the chance that you would choose a correct answer is 50%, which makes B correct. But if there’s only one correct answer, the odds of choosing the correct one at random goes back to 25%. And around and round you go.

There’s a lot of discussion at Richard Wiseman’s blog and more at Lifehacker, where I first saw this.

Posted in Brain Teasers

Hot My Entire Life

I have been hot my entire life. Put me in water or in a freezer for days and I will still be hot. My red color should tell you but don’t be deceived, even when I’m green, I’m still hot. What am I?

A red or green laser. Red and green pepper also works.

Technically, the laser beam itself isn’t hot, but lasers can heat up what they’re shining on.

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I Am Here, I Am There

I am here, I am there
I am burned into the mind of none
I walk on fire and live on ice
My words are meaningless for I talk not
I hate everyone yet fear no one
I have lived for centuries
Yet I have never existed
What am I?

Nothingness.

Posted in Riddles

How Old is Malcolm, His Dad and Grandfather?

Malcolm is the number of weeks of his father’s age treated as days and his grandfather’s age in months. All three of their ages add up to 120 years. How old is Malcolm, his father and his grandfather?

Malcolm is 6.
The father is 42. 42 days = 6 weeks.
The grandfather is 72. 72 months = 6 years.

Posted in Brain Teasers

Three Cuts to Turn a Round Cake Into Eight Equal Slices

How can you cut a round cake three times to make eight equal slices?

Cut #1 – Down the center of the cake (vertically) leaving two equal halves.
Cut #2 – Across the center of the cake (horizontally) leaving four equal slices.
Cut #3 – Through the middle edge of the cake slicing all four of the pieces in equal halves, leaving eight equal slices (four equal tops and four equal bottoms).

Posted in Brain Teasers

A Medication of Three Parts

I’m a medication with three parts. The first part is the surname of someone who has been a Mary and a Maria. The second part is a vital organ and the last is plentiful in the ocean.

What am I?

Andrews Liver Salts, an antacid. Julie Andrews played the role of Mary Poppins in the movie of the same name, and Maria in the Sound of Music. It’s tough to live without a liver and a taste of the ocean always includes a touch of salt.

Posted in Riddles

Sunny Weather Coming?

It’s raining at midnight. Will there be sunny weather in 72 hours?

No, because in 72 hours it will be midnight again.

Posted in Brain Teasers

I Have Wings But Cannot Fly

I have wings but cannot fly.
I can do the twist but can’t move around.
People enjoy relaxing in my company.

What am I?

A ceiling fan.

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