By removing one matchstick and adding one matchstick, can you convert the word "ZOO" to an animal name?

Why did Buffon take the goal with him after every Juventus match?

I am a prime number.
The double of myself is equal to the square of me.

which number am I?

Jigsaw captured 100 people and make them stand in a circle and all these people are labelled as Person1, Person2, Person3... Person100. He made them play a crazy game in which Person 1 shot Person 2 and pass the gun to the next person and so on until one stands alive.

Which person will survive in the end?

I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

I live in a bowl. I can swim. I have a tail. I also have fins and big eyes. What am I?

2, 3, 5, 9, 17, _ What is the next number in the sequence?

Can you place six X (crosses) in below board without making three in a row in any way ?

John said, "If yesterday was tomorrow, today would be Friday."

When did John make this statement?

John replied, when asked how old he was. In 2 years he will be twice as old as he was five years ago.' How old is he ?