What is the word or phrase?

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?

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

A mad serial killer kidnaps people and forces them to play the game of 2 pills with them, In this game, there are pills in the table and one of them is normal pill while the other one is deadly poisonous.
The victim will choose one pill and the killer will pick the other pill and both simultaneously will swallow the pill with water.
victim dies every time.

One day the serial killer kidnaps the Joseph and forces him to play the same game with him.

Joseph solves the mystery of the two pills and remains alive.

Explain?

John has played 50 ODI's and his average is 50. How many runs should he score in his 51st ODI, so that his average score jumps to 51?

Which statement is true out of the following?
One statement here is false.
Two statements here are false.
Three statements here are false.

A bomb goes off.
Carnage.
One person, only a few feet away, survives! How can this be?

Two in a corner, one in a room, zero in a house, but one in a shelter. What am I?

What can you see in the middle of March and April that you can never see in any other month?

You are in a room with no metal objects except for two iron rods. Only one of them is a magnet.
How can you identify which one is a magnet?