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

What does this rebus mean?

O
N
C
E
TIME

What has no start, end, or centre?

Whats the next number in the below number sequence pattern.

With pointed fangs I sit and wait; with piercing force I crunch out fate; grabbing victims, proclaiming might; physically joining with a single bite. What am I?

Can you fill the blank with the correct number?

6 30 870 756030 _____

Why do people go to bed?

A man desired to get into his work building, however he had forgotten his code.
However, he did recollect five pieces of information
* Fifth number + Third number = 14
* The fourth number is one more than the second number.
* The first number is one less than twice the second number.
* The second number and the third number equals 10.
* The sum of all five numbers is 30.

What is the code ?

What jumps when it walks and sits when it stands?

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