Find the number of squares in the below picture

Three doctors said that Bill was their brother. Bill says he has no brothers. How many brothers does Bill actually have?

In 1990, a person is 15 years old. In 1995, that same person is 10 years old. How can this be?

When Jack was six years old he hammered a nail into his favourite tree to mark his height. Ten years later at age sixteen, Jack returned to see how much higher the nail was. If the tree grew by five centimetres each year, how much higher would the nail be?

Take number 1000 and then add 20 to it.
Now add 1000 one more time.
Now add 30.
Now add 1000 one more time.
Now add 40.
Now add 1000 one more time.
Now add 10.

What is the total?

You are in a room that has three switches and a closed door. The switches control three light bulbs on the other side of the door. Once you open the door, you may never touch the switches again. How can you definitively tell which switch is connected to each of the light bulbs?

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?

Take 9 from 6, 10 from 9, 50 from 40, and leave 6.

How Come ??

By including only four matchsticks in below picture, you have to make "Four Triangles And Two Squares"

You can see three almost identical images below. Can you spot the odd one out from them?