How many sides does a circle have?

A non-stop marathon is the shared favourite sport of three brothers.

*The oldest one is fat and short and trudges slowly on.
*The middle brother's tall and slim and keeps a steady pace.
*The youngest runs just like the wind, speeding through the race.

"He is young in years, we let him run!" the other two brothers explained, "'because though he is surely number one, he is second, in a way." Why is it?

My friends called me Iron59 because my parents are a chemist and a mathematician. What is my real name?

Which part of London exists in France as well ?

In the given figure, move three matchsticks so that the resulting figure contains two rectangles.

A large container is kept in open under the rain. Every passing hour, the water collected inside the container becomes double what it was.

In ten hours, the container is filled completely. Can you calculate how long would it have taken to be filled in half?

How many bricks does it take to complete a building that is 15 feet wide, 30 feet deep, and 12 feet tall made of brick?

What word begins and ends with an E, but has only one letter?

Spelt forwards I’m what you do every day, spelled backwards I’m something you hate. What am I?

A shepherd had 18 sheep, out of which, all but ten died.

Can you tell us how many sheep was he left with?