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?

I know a number which is spelt in alphabetical order.
Do you?

What number comes next in this sequence:
7 8 5 5 3 4 4 _

You are in a room with no metal objects except for two iron rods. Only one of them is a magnet.
How can you identify which one is a magnet?

Below toothpicks/matchsticks indicate the group of fishes moving from west to east direction. Can you make them move from east to west by just moving three toothpicks/matchsticks?

When monkey rotate the gear, which mark will be hit 1 or 2 ?

A quarter is one-fourth of a dollar but Mr. John has changed the equation as below :

DOLLAR * 4 = QUARTER

Can you replace each letter with a digit to make the above solution correct?

What does this Rebus Picture mean?

I am quite hot but become too cold if you remove the first two letters. What am I?

Can you solve this amazing hard number series problem?
7, 8, 10, 12, 16, 18 ?