Can you place six X (crosses) in below board without making three in a row in any way ?

Can you replace the X (both small and big x) with the numbers between 1 to 19 such that all the rows of 3 numbers between X (big x) sum to 23?

A worker is to perform work for you for seven straight days. In return for his work, you will pay him 1/7th of a bar of gold per day. The worker requires a daily payment of 1/7th of the bar of gold. What and where are the fewest number of cuts to the bar of gold that will allow you to pay him 1/7th each day?

What number when divided in half becomes zero?

What kind of band never plays music?

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

Can you count the number of quadrilaterals in the picture below?

How is a fly different from a mosquito?

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?

John was piloting a plane behind a car but was never able to overtake it. Why?