It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

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?

You are given 16 witch hats. The hats are divided in four different colours – red, blue, green and yellow. Every colour has been assigned to four hats. Now each of the hat will be glued with a label of an arithmetic sign – ‘+’, ‘-‘, ‘x’ or ‘/’. But you can label one sign only once on one colour. In such an arrangement, the hats can be uniquely defined by its colour and symbol.

Can you arrange all the 16 hats in a 4x4 grid in a fashion that no two rows and columns have a repetition of colour or sign?
We have arranged four hats in the below picture to assist you.

What is the largest amount of money that you can possess in change and still if someone asks you for a dollar, you won't be able to give?

A sundial has the fewest moving parts of any timepiece. Which has the most?

I make a loud sound when I’m changing. When I do change, I get bigger but weigh less. What am I?

A Child was born in Lahore, Pakistan. Still, the child is not a Pakistani citizen. why?

Irene killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

Two-person want to cross a river. Only one boat is present on the riverside that can carry only one person at a time.

However, they still manage to cross the river. How is it possible?

John was drowned by he was not wet. How?