I’ll Always Smile Back

If you drop me I’m sure to crack but give me a smile and I’ll always smile back

A mirror.

Posted in Riddles

Four Letters and a Fruit or Vegetable

I have four letters in my name,
I am a fruit or a vegetable,
I look like a giant green onion,
I end with the letter k.

What am I?

The leek. It has four letters, has been considered both a fruit and a vegetable, looks like a green onion and ends with the letter k.

Posted in Riddles

If You Break Me, I Don’t Stop Working

If you break me
I do not stop working,
If you touch me
I may be snared,
If you lose me
Nothing will matter.

Your heart.

Posted in Riddles

When Is The Equation Correct?

When is the following equation correct?

14 + 1 = 3

When dealing with 24-hour time, 1400 hours plus 1 hour is 1500 hours, also known as 3 o’clock.

Posted in Brain Teasers

The Mysterious 6th Floor Window

A man was looking through a window on the 6th floor, opened it, thought for a minute then jumped, passing through the open window, but he was not injured. How was this possible?

He was a window washer and he was entering the building.

Posted in Brain Teasers

The 22nd and 24th Presidents of the U.S.

The 22nd and 24th presidents of the United States of America had the same parents, but were not brothers. How is this possible?

It was the same guy! Grover Cleveland is the only president in history to serve two, non-consecutive terms.

Posted in Brain Teasers

Mysterious Math

This problem can be solved by preschool children in five to ten minutes, by programmers in an hour and by people with higher education…well, check it yourself.

8809 = 6
7111 = 0
2172 = 0
6666 = 4
1111 = 0
3213 = 0
7662 = 2
9313 = 1
0000 = 4
2222 = 0
3333 = 0
5555 = 0
8193 = 3
8096 = 5
1012 = 1
7777 = 0
9999 = 4
7756 = 1
6855 = 3
9881 = 5
5531 = 0
2581 = ?

What is the missing number and why?

Two. The number is how many closed circles there are in the 4 digits. 0, 6 and 9 each have one, 8 has 2.

Posted in Brain Teasers

Move Your Digits

By moving one of the following digits, make the equation correct.

62 – 63 = 1

26 – 63 = 1
(26 = 2x2x2x2x2x2 = 64, ∴ 64 – 63 = 1)

Posted in Brain Teasers
Tagged with

Only Self-Enumerating Number

What is the only self-enumerating number in English?

Four. The number four has four letters, making it self-enumerating. Interestingly, there are no self-enumerating numbers in French.

Posted in Brain Teasers

Five Three Two

What is the answer to the last equation?

5 3 2 = 151012
9 2 4 = 183662
8 6 3 = 482466
5 4 5 = 202504
7 2 5 = ?

10000 × (x × y) + 100 × (x × z) + transpose_digits(x × y + y × z)

transpose_digits() just swaps the digits

Posted in Brain Teasers