What you cannot hold but it is yours?

Can you count the number of squares in the figure below?

It belongs to you, but other people use it more than you do. What is it?

You have two buckets of 11 liters and 6 litres.
How can you measure exactly 8 litres?

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?

What has 13 hearts but no other organs?

What does an Island and the letter T have in common?

If an electric train is travelling south, then which way is the smoke going?

If nine thousand, nine hundred nine dollars is written as $9,909,
how should twelve thousand, twelve hundred twelve dollars be written?

I know a 5-digit number having a property that With a 1 after it, it is three times as large as it would be with a one before it.

Guess the number?