Riddles and Brain Teasers

Crawl on the Earth, Rise on Pillar

I crawl on the earth and rise on a pillar.

What am I?

A shadow.

Posted in Riddles

An Urgent Phone Call

A man was working the night shift when he received an urgent phone call, giving him information that caused him to dash home at breakneck speed.

On bursting into his bedroom quite breathless he found his informant was quite correct. His wife was in bed with someone he had never seen before.

However, far from being angry, he greeted them both with a smile and a few hours later brought them both breakfast in bed.

What is the explanation for this odd behavior?

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His wife had just given birth.

Posted in Brain Teasers

Joe and Andrea want to copy three 60-minute cassette tapes. They have a 2-cassette recorder to copy the tapes, allowing them to copy two tapes at a time. Each side takes 30 minutes to be copied, so two tapes can be copied in an hour and the third will take another hour. Andrea bets Joe she can copy all three tapes in 90 minutes. Does she win the bet?

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In the first 30 minutes Andrea copies the A sides of tape 1 and 2.
In the second 30 minutes, she copies tape 1 side B and tape 3 side A (finishing Tape 1).
In the last 30 minutes, she copies tape 2 side B and tape 3 side B.

Posted in Brain Teasers

An Eye In a Blue Face

An eye in a blue face
Saw an eye in a green face.
“That eye is like to this eye”
Said the first eye,
“But in low place,
Not in high place.”

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A daisy in the grass. The big eye is the sun.

This is from J.R.R Tolkien’s The Hobbit.

Posted in Riddles

Ages Of Myself and My Brother

My current age, is the age of my 14 year-old brother plus one third of my age. How old will I be when my brother is twice his current age?

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I will be 35. I am currently 21.

x = my current age

x = 14 + x/3
3x = 42 + x
2x = 42
x = 21 (so 14 years later, I'll be 35)

Posted in Brain Teasers

Tongue Can’t Taste, Throat Can’t Swallow

What has a tongue that can’t taste, a throat that can’t swallow, eyes that can’t see and a soul that will never die?

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A shoe. It has a tongue, a throat, eyes (or eyelets) and a sole. I used soul here or else it would have given the answer away, but this riddle works best when told rather than read. And as the joke goes, old shoes never die, they just lose their sole.

Posted in Riddles

Four Cards

Four cards are placed in front of you on the table, each with a number on one side and a color on the other. The visible cards show 3, 8, red and brown. Which cards should you turn over in order to test the truth of the statement that if a card shows an even number on one face, then its opposite face is red?

four-cards

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You’d need to turn over only the 8 and brown card. Only a card with an even number on one face and which is not red on the other face can invalidate the stated rule. If you turn over the 3 card and it’s not red, it doesn’t invalidate the rule, nor does turning over the red card and finding it has the label 3.This test was devised by Peter Cathcart Wason and is known as the Wason selection task. Less than 10% of test subjects got it correct in two separate studies.

This test was devised by Peter Cathcart Wason and is known as the Wason selection task. Less than 10% of test subjects got it correct in two separate studies.

Posted in Brain Teasers

2, 3, 6

What number comes next in this series?

2 3 6 7 1 9 4 5 ___

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8. The numbers are in reverse alphabetical order.

Two, three, six, seven, one, nine, four, five, eight.

Posted in Brain Teasers

The Bookworm

A bookworm eats from the first page of an encyclopedia to the last page in a straight line. The encyclopedia consists of ten 1000-page volumes and is sitting on a bookshelf in the usual order. Not counting covers, title pages, etc., how many pages does the bookworm eat through?

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__ __ B| | | |F A|1 |...........................|10|R C| | | |O K| | | |N |__| |__|T ------------------------------------- On a book shelf the first page of the first volume is on the “inside”, so the bookworm eats only through the cover of the first volume, then 8 times 1000 pages of Volumes 2 – 9, then through the cover to the 1st page of Vol 10 for a total of 8,000 pages.Note: The question asks how many pages, not how many sheets of paper.

        __                             __
      B|  |                           |  |F
      A|1 |...........................|10|R
      C|  |                           |  |O
      K|  |                           |  |N
       |__|                           |__|T
      -------------------------------------

On a book shelf the first page of the first volume is on the “inside”, so the bookworm eats only through the cover of the first volume, then 8 times 1000 pages of Volumes 2 – 9, then through the cover to the 1st page of Vol 10 for a total of 8,000 pages.

Note: The question asks how many pages, not how many sheets of paper.

Posted in Brain Teasers