If all Goats are Sheep and all Sheep are Deers, are all Deers Goats ?

If it took eight men ten hours to build a wall, how long would it take four men to build it?

Below, you will find the mathematical proof that 10 equals 9.99999?. But is that possible or there is something wrong about it? Can you find the error?

x = 9.999999...
10x = 99.999999...
10x - x = 90
9x = 90
x = 10

You measure my life in hours
I serve you by expiring
I vanish faster when I am thin
and slower when I am thick
The wind is my energy
What am I?

You can take four of the five letters out of this word, but the pronunciation never changes. What is the word?

While preparing the table for dinner, wife came up with an idea to tease his mathematician husband. She asked her husband to pick nine toothpicks and make ten without breaking any toothpick.

The husband was also smart and did it within seconds. How ?

There’s a girl who has a large family. She has an equal amount of brothers and sisters, but each brother only has half as many brothers and sisters. What’s the correct amount of brothers and sisters?

O_er_t_o_

Complete the missing letters of the given word.

A sundial has the fewest moving parts of any timepiece. Which has the most?

What does the following represent?

N N N N N N N

A A A A A A A

C C C C C C C