Count the number of triangles in the picture below:

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?

Solve the rebus riddle in the picture below.

In 1990, a person is 15 years old. In 1995, that same person is 10 years old. How can this be?

How can you spell "White of an egg" in one word?
Hint: I know you can spell coke, poke, and joke.

How many Watermelons are there in the below picture?

If,

6 / 7 = 2
3 / 9 = 7
8 / 2 = 6

Then

4 / 5 = ?

What is the fastest way to double your money?

A time long back, there lived a king who ruled the great kingdom of Trojan House. As a part of the renovation of the kingdom to meet future security needs, he asked his chief architect to lay down a new play in a manner that all of his 10 castles are connected through five straight walls and each wall must connect four castles together. He also asked the architect that at least one of his castles should be protected with walls. The architect could not come up with any solution that served all of King's choices, but he suggested the best plan that you can see in the picture below. Can you find a better solution to serve the king's demand?

I am a prime number.
The double of myself is equal to the square of me.

which number am I?