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?

A finger goes in me. You fiddle with me when you're bored. The best man always has me first. What am I?

Can you replace the question mark with the correct number?

I am white when I am dirty, and black when I am clean. What am I?

What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?

Find the hidden tiger in the given optical illusion ?

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

There are 2 people near the river and both of them want to get on the other side. The boat can only take one of them. But they got across.
How?

There is something which is always coming but never arrives?

See the given image carefully. What you have to do is move the blue checkers in the position of the black checkers and vice versa. You are only allowed to move the checker to an adjacent empty space. Do it in the least possible moves.