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

A pond had 60 fish, out of which, all but 20 died.
How many fishes are now present in that pond?

John was drowned by he was not wet. How?

An American nightclub called 'The Coconut Grove' had a terrible fire in which over 400 people died. A simple design flaw in the building led to a high death toll. Subsequently, regulations were changed to ensure that all public buildings throughout the country eliminated this one detail, which proved deadly. What was it?

He digs out tiny caves and stores gold and silver in them. He also built bridges of silver and made crowns of gold. They are the smallest you could imagine. Sooner or later everybody needs his help, yet many people are afraid to let him help them. Who is he?

In the image below, can you find the value of an angle(y)

Why is the Hole below a Lock?

The more it dries, the wetter it becomes. Can you tell what it is?

Can you guess the name of the month by looking the below rebus ?

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?