A large container is kept in open under the rain. Every passing hour, the water collected inside the container becomes double what it was.

In ten hours, the container is filled completely. Can you calculate how long would it have taken to be filled in half?

By using all numbers, i.e. 123456789 and subtraction/addition, operators number 100 can be formed in many ways.
Example: 98 + 7 + 6 - 5 - 4 - 3 + 2 - 1 = 100

But if we add a condition use of the number 32 is a must. Then there are limited solutions.
One of such solution is: 9 - 8 + 76 + 54 - 32 + 1 = 100

Can you tell me any other solution?

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

There are 3 apples in the basket and you take away 2. How many apples do you have now?

A and B have a certain number of chocolates with them. If B gives one chocolate to A, they will have an equal number of chocolates. But if A gives one chocolate to B, then A will be left with half the number of chocolates that B has.

Can you find out the number of chocolates they have right now?

How could a baby fall out of a twenty-story building onto the ground and live?

Move three sticks of the spiral below to form a square.

I throw two dice simultaneously.

What is the probability of getting a sum as 9 of the two numbers shown?

John killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

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