The Blanks of UND

Fill in the blanks:

U N D _ _ _ _ _ U N D

UNDERGROUND

Posted in Brain Teasers

Wily Winifred and the Case of the Odd Numbers

Mrs. Shine was having a rough day and wanted a break. So she asked her class to calculate the sum of the first 50 odd numbers. In a few moments, Winifred was at her desk with the correct answer of 2,500. Stunned, Mrs. Shine figured she must have gotten lucky, and sent precocious Winifred back to her seat with the task of finding the sum of the first 75 odd numbers. Again, Winifred returned in seconds with the correct answer (5,625).

How did Winifred find the answer so quickly?

Winifred, being the precocious child she is, realized there was a pattern when computing smaller sums of odd numbers.

First 3: 1 + 3 + 5 = 9
First 4: 1 + 3 + 5 + 7 = 16
First 5: 1 + 3 + 5 + 7 + 9 = 25

Do you see the pattern like our dear friend Winnie?

For the first n odd numbers, the sum is equal to n2. Thus the first 50 is 502, or 2,500, and the first 75 is 752, or 5,625.

Posted in Brain Teasers

None There’ll Be

There is a word of letters three,
Add one letter to it and none there’ll be.

What is the word?

One. Add an ‘n’ to get none.

Posted in Riddles

What State Is Round On One Side

What state is round on one side, high in the middle, and round on the other side?

Ohio. This one works a little better when spoken rather than read, but O is round, hi sounds like high and the last O is as round as the first.

Posted in Riddles

I Start Out The Same As Others

I start out the same as others,
Then grow to four legs and four arms,
And two hearts beat inside,
Until the separation.

What am I?

A pregnant woman is like other women, then the baby forms, and then is delivered.

Posted in Riddles
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Three Digits in a Row

On a regular 12-hour digital clock how many times would the same three digits in a row be displayed (e.g. 1:11, 11:12, 12:22) in one day?

34 times. These 17 instances will be visible twice in a 24 hour period.

1:11
2:22
3:33
4:44
5:55
10:00
11:10
11:11
11:12
11:13
11:14
11:15
11:16
11:17
11:18
11:19
12:22

Posted in Brain Teasers

Which Door First?

While driving his car a man slams on the brakes when he sees, in the middle of the street, a diamond studded door, a gold door and a silver door. Which door does he open first?

His car door

Posted in Brain Teasers

Which Are True and Which Are False?

A. When a car is driven forwards the wheels rotate counter-clockwise.
B. If a clock is put forward 1 1/4 hours the minute hand moves through 450°
C. When a clock reads 4.10 the acute angle between the hands is exactly 60°

A. False – The near-side wheels rotate counter-clockwise, but the far-side wheels rotate clockwise.
B. True
C. False – The acute angle is a little more than 60° because by the time the minute hand reaches 10, the hour hand will have moved slightly past the 4.

Posted in Brain Teasers

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?

His wife had just given birth.

Posted in Brain Teasers

Same Forward, Backward and Upside Down

What word is the same written forward, backward and upside down?

NOON. The word needs to be a palindrome and made up of only these letters that look the same upside down:

H I N O S X Z

For instance, SOON doesn’t work, because even though each letter looks the same upside down, it reads NOOS.

Posted in Riddles