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

I am the beginning of the end, and the end of time and space. I am essential to creation, and I surround every place. What am I?

What does this below rebus puzzle mean?

You need to arrange three 7 and mathematical symbols to form number 1?

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

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

On a magical land of Mexico , all the animal in the land are rational.

There are 10 tigers and one goat.
Tiger can eat goat but since it's a magical land , the tiger who eats the goat , turns into goat and then can be eaten by the remaining tiger(s).

If we leave them for some time then how many goat and tiger will be there , when we come back ?

The teacher told the student that if he told a lie then he will be expelled from school and if he told the truth then he still is expelled from school.

What can a student say to prevent his being expelled from school?

What does the below rebus riddle means?

A four-digit number (not beginning with 0) can be represented by ABCD. There is one number such that ABCD=A^B*C^D, where A^B means A raised to the B power. Can you find it?