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.

I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?

Do you know of a place where the wind blows south and then suddenly shifts direction towards the north?

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

A network of 20 x 10 squares is given to you.

Can you calculate how many unique squares and rectangles can be formed combining two or more individual squares ?

Two girls were born to the same mother, on the same day, at the same time, in the same month and year and yet they're not twins. How can this be ?

Replace the letters of words with a number so that the below equation holds true

BASE +
BALL
---------
GAMES
----------

What is wrong in the below Picture?

You have a roll of cloth 1km long. You have a machine which cuts this roll into pieces of 10-meter-long cloth.

How long would it take for the machine to cut the roll if each cut took 4 secs?

By moving exactly three matchsticks can you make the below equation true.It can be solved by 3 ways.