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

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 ?

Can you find a number that lies one third of the distance between 1/3 and 2/3?

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

You are given a cube that is made with the help of 10x10x10 smaller cubes summing up to a total of 1000 smaller cubes. You are asked to take off one layer of the cubes.
How many remain now?

How is a fly different from a mosquito?

Suppose we lay down two cups in front of you. One of the cups is filled with tea and the other one with coffee. Now we ask you to take a spoonful of tea and mix it with the coffee. At this moment, the coffee cup has a mixture of tea and coffee. You have to take that mixture (spoonful) and add it back to the tea.

Can you now tell if the cup of coffee has more tea or the cup of tea has more coffee?

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?

That attorney is my brother, testified the accountant.

But the attorney testified he didn't have a brother.

Who is lying?

Irene killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?