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

How can you take 2 from 5 and leave 4?

A word I know has six letters it contains, remove one letter and 12 remain. What is it?

Can you find the missing letter in the sequence?
S - T - I - L - ? - T - F - Y - C

I know a country, If you remove the last alphabet of its name, it will become a part of your body. Do you name it?

Jenifer is learning to drive her car. She went down a one way lane and in the wrong direction. But she do not break any law.

How come ?

A person is found murdered in his Chamber. When the crime scene is investigated, the Investigator find out that there is a calendar on which the victim has written a few numbers with his blood. The numbers are 4, 11, 11 and 4.

There are four suspects in the murder, John, Jacob, Anna and Lee. Can you find out who is the murderer?

I have nine bottles of wine and one of the nine bottles is poisoned.
I need to find the poisoned bottle with two facts
(1) Poison is deadly, only a sip will cost death
(2) I have two mice to do so.

How should I do it?

Can you count the number of squares in the given picture?

By removing one matchstick and adding one matchstick, can you convert the word "ZOO" to an animal name?