Once upon a time, there was a castle on a square island. The entire island was surrounded by a 14m wide trench. The Romans had wanted to invade the castle and had brought a few wooden planks along with them to facilitate themselves in crossing the moat. The planks were however found to be only 13m long.

The Romans still managed to cross the trench. How did they do it?

What can you see in the middle of March and April that you can never see in any other month?

Make eight squares by moving only two matchsticks.
Note- Square can be of different sizes.

Find out the number of circles in the given picture having Illusion

Can you move 2 matchsticks to form four equal sized squares.

An octopus has 8 legs. A hippogriff has 6 legs and 2 pairs of wings. A sphinx has 6 legs and one pair of wings. Now we have all 3 kinds and a total of 18 insects in a cage. We have a total of 118 legs and 20 pairs of wings. How many insects do we have of each kind?

In order to complete the racing competition, the Mexico racetrack has to submit its top and the most famous three horses to win the competition. Due to an electrical storm, all the records are cleared and no one knows which horse holds the record. They all look identical and it becomes even more difficult to differentiate the horses. There are 25 horses in the Mexico racetrack. But there can be only five horses at a time on the track. What will the least number of races that can be conducted to find out the three fastest horses?

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

Can anyone tell me a word in the English dictionary which has a silent 'z'?

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