Two girls were born to the same mother, on the same day, at the same time, in the same month and year and yet they're not twins. How can this be ?

I cannot talk, but I always reply when spoken to. What am I?

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

There’s a girl who has a large family. She has an equal amount of brothers and sisters, but each brother only has half as many brothers and sisters. What’s the correct amount of brothers and sisters?

At a Society election for president, precisely 963 votes were cast.
There is a total of 4 candidates that participate in the election.

The winning candidate exceeds the opponents by 53, 79 and 105 votes.

How many votes do each candidate gets?

There is something which is always coming but never arrives?

A chicken farmer has figured out that a hen and a half can lay an egg and a half in a day and a half. How many hens does the farmer need to produce one dozen eggs in six days?

What seven-letter word has hundreds of letters in it?

How many pluses should we put between the digits of 987654321 to get a total of 99, and where?

How many letters are in the alphabet?