Below the four parts have been reorganised. The four partitions are exactly the same in both arrangements. Why is there a hole?

There are two candles. Both will only burn exactly for an hour. How will you use these two candles to measure forty-five minutes?

A rain drop fell from one leaf to another leaf and lost 1/4th of its volume. It then fell to another leaf and lost 1/5th of the volume. It again fell on another leaf and lost 1/5th of the volume.



This process kept repeating till it fell on the last leaf losing 1/75th of its volume.



Can you calculate the total percentage of loss from the initial volume when the drop has fallen to the last leaf accurate up to two decimal places?

A deaf and mute man goes to the train station. Tickets for the train are 50 cents each. The man goes to the ticket booth and hands the man inside just a dollar. The man in the booth hands him two tickets.

How did the man in the booth know to give him two tickets without even looking at him?

Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?

Count the Triangle in the figure given below:

Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

Your last good ping-pong ball fell into a narrow metal pipe embedded one foot deep in concrete.
How can you get it out undamaged, if all the tools you have are your tennis paddle, shoe laces, and plastic water bottle, which does not fit into the pipe?

Using eight eights and addition only, can you make 1000?

Three fair coins are tossed in the air and they land with heads up. Can you calculate the chances that when they are tossed again, two coins will again land with heads up?