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?

John left on a horse on Thursday , was gone for two days, and came back on Thursday after completing his work. How did that happen?

The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

Find The Next Number in the series:

12 13 15 17 111 113 117 119 123 ?

There is so small cabin inside a deep forest.
All the forest burned out to worst possible but the inside of the cabin is still the same.
However all the person inside the cabin die.

How come ?

A boy was at a carnival and went to a booth where a man said to the boy, "If I write your exact weight on this piece of paper then you have to give me $50, but if I cannot, I will pay you $50." The boy looked around and saw no scale so he agrees, thinking no matter what the carny writes he'll just say he weighs more or less. In the end the boy ended up paying the man $50. How did the man win the bet?

Can you place six matchsticks in a manner that each of the matchsticks is in touch with the other five matchsticks?

using four eights (8) and a one (1) and one mathematical symbol , create the number 100

The below given figure comprises of a pattern through which you can determine the missing letter. Can you push your mind to find the pattern and add the missing letter?

I am a five-letter word under you,
Remove the first letter and I am above you,
Remove the second as well and I am around you.

Who am I?