Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?

It comprises roots which nobody sees,
Much taller than those trees,
Up and up it goes,
Still it never grows?

Solve the following series:
AZ, GT, MN, __, YB

Can you name some countries which do not have the alphabet 'A' in them?

A man is walking down a road with a basket of eggs. As he
is walking he meets someone who buys one-half of his eggs
plus one-half of an egg.
He walks a little further and meets another person who buys
one-half of his eggs plus one-half of an egg.
After proceeding further he meets another person who buys
one-half of his eggs plus one half an egg. At this point, he
has sold all of his eggs, and he never broke an egg.
How many eggs did the man have to start with?

What is so fragile that saying its name breaks it?

There are forty elephants and they have forty-fore heads. How can this be possible?

A man is found dead with a knife in his back When the investigation is done. A chair lays beside him and the forensic team finds moisture around the body.

If he committed suicide, how did he do it?

In the given figure, you can see that four match sticks are used to form a square. Can you form five squares by using six matches?

In particular commonwealth games, a female participant won silver and gold medals for a single event.

How can this be possible?