When can we add 2 to 11 and get 1 as the correct answer?

A girl has as many brothers as sisters, but each brother has only half as many brothers as sisters. How many brothers and sisters are there in the family?

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

By including only four matchsticks in below picture, you have to make "Four Triangles And Two Squares"

It's a protector.
It sits on a bridge.
One individual can see directly through it, while others wonder what it hides.

What is it?

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?

Which is heavier: a ton of bricks or a ton of feathers?

What is the four-digit number in which the first digit is one-third the second, the third is the sum of the first two, and the last is three times the second?

I am a type of word that is spelt incorrectly or used differently, on purpose for humour. What am I?
Hint 1: You can find me in a joke.
Hint 2: I am a play on words.

Can you find the odd number in the following five choices?

1) 482636
2) 259807
3) 865195
4) 104739
5) 391744