Find the number of squares in the below-given picture.

Replace the question mark with the correct number in the below-given picture?

In the given picture, in how many ways can you read the word "Tiger"?

Do You See It?

100 prisoners are stuck in the prison in solitary cells. The warden of the prison got bored one day and offered them a challenge. He will put one prisoner per day, selected at random (a prisoner can be selected more than once), into a special room with a light bulb and a switch which controls the bulb. No other prisoners can see or control the light bulb. The prisoner in the special room can either turn on the bulb, turn off the bulb or do nothing. On any day, the prisoners can stop this process and say "Every prisoner has been in the special room at least once". If that happens to be true, all the prisoners will be set free. If it is false, then all the prisoners will be executed. The prisoners are given some time to discuss and figure out a solution. How do they ensure they all go free?

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

By removing one matchstick and adding one matchstick, can you convert the word "ZOO" to an animal name?

A frog is at the bottom of a 30-meter well. Each day he summons enough energy for one 3-meter leap up the well. Exhausted, he then hangs there for the rest of the day. At night, while he is asleep, he slips 2 meters backwards. How many days does it take him to escape from the well?

I have lakes with no water, mountains with no stone and cities with no buildings. What am I?

Can you tell a 3D object that has just two surfaces?