I look at you, you look at me I raise my right, you raise your left. What am I?

There are 20 people in an empty, square room. Each person has full sight of the entire room and everyone in it without turning his head or body, or moving in any way (other than the eyes). Where can you place an apple so that all but one person can see it?

You have a three-gallon and a five-gallon measuring device. You wish to measure out four gallons.

John, Jack and Jill are in a desert. John doesn't like Jill and hence decides to murder him. He poisons the water supply of Jill. Since it is a desert area, Jill must drink or he will die of thirst.

Jack does not know of the actions of John and also decides to murder Jill. To succeed in his ill motives, he removes the water supply of Jill so he dies of thirst.

Jill dies due to thirst. Who murdered Jill?

Can you find the missing piece of the Porsche?

I am a normal creature, but I have five hands. I can even have more but even then I will be considered normal.

Who am I?

What always comes into a house through the keyhole?

Solve the equation in the image by looking at the pattern closely.

I know there are two methods by using three time the same number with a plus(+) operator , you can make sum as 60.

One of them is 20+20+20.

whats the other way ?

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?