A word I know has six letters it contains, remove one letter and 12 remain. What is it?

I possess a head

I flaunt a tail

But I don't have mouth or legs

Can you find out who I am?

A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?

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

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

You are stuck on an island where you have nothing. You find four pieces of paper somewhere on the island. What will be your strategy to escape from the island safely?

PS: No other resource is available to you on the island, neither can you build anything.

It's a protector.
It sits on a bridge.
One individual can see directly through it, while others wonder what it hides.

What is it?

A girl is twice as old as her brother and half as old as her father. In 50 years, her brother will be half as old as his father. How old is the daughter now?

A bag contains 64 balls of eight different colours. There are eight of each colour (including red). What is the least number you would have to pick, without looking, to be sure of selecting 3 red balls?

There are four 3-link chains. All you have to do is join them into a big 12-link chain. For joining two closed links, one of the links must be cut and placed onto the other link for closing.

How many minimum links will you have to cut to make the big chain?