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?

As shown in the image, the nine Dogs are square fenced. By constructing just two square fences can you make sure that two Dogs cannot meet each other without crossing the fence?

He does not have any heart but still, He manages to live.
If you kill him, you will eventually die but yet you kill him.
He cannot run, who is He?

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

How many Watermelons are there in the below picture?

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?

Why is the Hole below a Lock?

At my favorite fruit stand,
an orange costs 18,
a pineapple costs 27,
and a grape costs 15.
Using the same logic, can you tell how much a mango costs?

The dirtier I get, the whiter I look. Who am I?

How many pluses should we put between the digits of 987654321 to get a total of 99, and where?