Replace the question mark with the number below given a simple math problem.

What is the largest amount of money that you can possess in change and still if someone asks you for a dollar, you won't be able to give?

Which Travels Faster? Solve below famous picture riddle:

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?

It is always ahead of me yet I can never see it. What is it?

Which digit occurred maximum times between the number 1 and 1000?

I know a ten-letter word in the English language which can be typed using only the top rows of the computer keyboard.

What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?

The average age of 10 members of a committee is the same as it was 4 years ago, because an old member has been replaced by a young member. Find how much younger is the new member ?

Solve below rebus puzzle?