All of Jacob's shoes are red except two.
All of Jacob's shoes are green except two.
All of Jacob's shoes are yellow except two.

How many shoes does Jacob have?

Using the clues below, what four numbers am I thinking of?

The sum of all the numbers is 31.
One number is odd.
The highest number minus the lowest number is 7.
If you subtract the middle two numbers, it equals two.
There are no duplicate numbers.

You have to put a letter on the following to make it a meaningful word. The only challenge is that you can't use 'E'.

S E Q U E N C _

There are 20 people in an empty, square room. Each person has full sight of the entire room and everyone in it without turning his head or body, or moving in any way (other than the eyes). Where can you place an apple so that all but one person can see it?

What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?

How can you drop a raw egg from a height onto a concrete floor without cracking it?

What word is represented by this rebus?

Can you count the number of triangles in the given picture?

You can hear me, but you can't touch or see me.

What am I?

What has a bottom at the top?