I speak without a mouth, and hear without ears. I have no-body, but I come alive with the wind. What am I?

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

The day before yesterday I was 25 and the next year I will be 28. This is true only one day in a year. What day is my birthday?

Three people enter a room and have a green or blue hat placed on their heads. They cannot see their own hat but can see the other hats.
The colour of each hat is purely random. They could all be green, blue, or any combination of green and blue.
They need to guess their own hat colour by writing it on a piece of paper, or they can write 'pass'.
They cannot communicate with each other in any way once the game starts. But they can have a strategy meeting before the game.
If at least one of them guesses correctly they win $10,000 each, but if anyone guesses incorrectly they all get nothing.
What is the best strategy?

I have lakes with no water, mountains with no stone and cities with no buildings. What am I?

My grandson is about as many days as my son in weeks, and my grandson is as many months as I am in years. My grandson, my son and I together are 120 years. Can you tell me my age in years ?

What is wrong in the below Picture?

A seven-year-old kid challenged his classmates that he can make the number one disappear by adding something to it.

How can he do that?

The person who makes it has no need for it. He who purchases it does not use it. The person who does use it does not know they are. What is it?

It begins where the time ends.
Its second is an expression of surprise.
Its third is a question.
Its fourth is urinate.
It ends with a drink.

Which country it is?