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?

If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

How much will a 38° angle measure when looked at under a microscope that magnifies ten times?

How is a fly different from a mosquito?

A mother is 21 years older than her child. In exactly 6 years from now, the mother will be exactly 5 times as old as the child.
Where's the father?

What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?

There is a square piece of paper with a hole that is denoted by the circle on the top right side in the given picture. You have to cut the paper in a manner that it forms two and only two separate pieces of paper and then rearrange the pieces in a manner that the holes come in the centre of the paper.

You have a three-gallon and a five-gallon measuring device. You wish to measure out four gallons.

In the picture, you can see a chess board. On the top left position, the K marks a knight. Now, can you move the knight in a manner that after 63 moves, the knight has been placed at all the squares exactly once excluding the starting square?

Move three sticks of the spiral below to form a square.