Take one out and scratch my head, I am now black but once was red. What am I?

They are three errirs in this question. Can you find them?

If a zookeeper had 100 pairs of animals in her zoo, and two pairs of babies are born for each one of the original animals, then (sadly) 23 animals don’t survive, how many animals do you have left in total?

I always drive my customer away.

Who am I?

using four eights (8) and a one (1) and one mathematical symbol , create the number 100

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?

What's the only room from which no one can enter or leave

The day before yesterday I was 25 and the next year I will be 28. This is true only one day in a year. What day is my birthday?

A man says, "Brothers and sisters, have I none, but that man's father is my father's son." Who is that man?

The host of a game show offers the guest a choice of three doors. Behind one is an expensive car, but behind the other two are goats.
After you have chosen one door, he reveals one of the other two doors behind which is a goat (he wouldn't reveal a car).

Now he gives you the chance to switch to the other unrevealed door or stay at your initial choice. You will then get what is behind that door.

You cannot hear the goats from behind the doors, or in any way know which door has the prize.

Should you stay, or switch, or doesn't it matter?