How can you make number one disappear by adding something to it?

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

I was speeding and ran through a stop sign, yet two traffic officers who were there do nothing about it.

why?

If,
29 - 1 = 30
9 - 1 = 10
14 - 1 = 15

Based on similar logic, Can you prove that the below algebraic equation is true?
11 - 1 = 10 ?

The world's largest Thanksgiving turkey was on display at a fair. Everyone was admiring it when suddenly a woman ran up and shot the turkey and left. Everyone knew her yet nobody made any attempts to stop or report her. Why?

There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes

How many bananas can you eat if your stomach is empty?

A man was gazing through the window of the 23rd floor of the building. He suddenly opened the window and jumped on the other side of the window. On landing on the floor, there was not a sheer mark of injury on him.

How can that be possible if he did not use any kind of parachute and did not land on a soft surface?

Chef Andrea has to light the kitchen stoves to open her restaurant for the day. There are three stoves in the kitchen: A glass stove, a brick stove, and a wood stove. She only has one match. Which does she light up first?

What does the following represent?

N N N N N N N

A A A A A A A

C C C C C C C