A man plots the murder of his wife. His plan is full proof. Nobody saw them leaving their house. He stabbed her with a knife while driving. She died on the spot. He threw her body in a valley. He threw the knife carefully wiping his finger prints on a random garbage bin. Then he went back to his home and no one was watching him this time as well.

After an hour, he was called by the local police department who informed him that his wife was murdered. They asked him to reach the scene of crime immediately. But as soon as he arrived at the crime scene, he was arrested by them.

How did the police know that he himself is the murderer?

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

What number should come in place of the question mark below?

The cream is heavier than Milk. True or False?

81 x 9 = 801. What must you do to make the this equation true?

Look at the picture and find out which square is not linked with any of the other squares.

There are three light switches outside a room. One of the switches is connected to a light bulb inside the room.
Each of the three switches can be either 'ON' or 'OFF'.

You are allowed to set each switch the way you want it and then enter the room(note: you can enter the room only once)

Your task is to then determine which switch controls the bulb?

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

Can you find the least possible number such that

If the number is divided by 3, it gives the remainder of 1;
If the number is divided by 4, it gives the remainder of 2;
If the number is divided by 5, it gives the remainder of 3;
If the number is divided by 6, it gives the remainder of 4.

I never stop running even when I standstill. If I am formed by joining two identical bodies together, can you guess who I am?