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

There are two guys standing face to face in a room. On a wall, there is a clock. One of those is a prophet. He tells the other guy that he will be stabbed in the back in five minutes.

Shocked to hear that, the other guy stares at the clock. Just after the five minutes, he is stabbed on the back. Can you tell what happened?

What number does the below three word/phrase identify and why?
1. Deck
2. Year
3. Singing in the Rain

What you cannot hold but it is yours?

Which is the smallest number that you can write using all the vowels exactly once?

Find three numbers such that

* When we multiply three numbers, we will get the prime numbers.
* The difference between the second and the first number is equal to the third and second.

John can place six large boxes or nine small boxes into a carton.

Can you find out in how many cartons can he place sixty-six boxes in total?

In the four images below, can you find the odd one out?

During which month do people sleep the least?

Can you find out the number that should replace the question mark with a valid reason?