Do You See It?

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?

How many triangles are there on the puzzle below?

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

When you say goodbye, I am what you need to tie.
I come as a couple and go wherever you run.
Who am I?

Three friends named Mr. Black, Mr. Yellow and Mr. Green enter a pub on a weekend night. They are wearing either a Black, Yellow or Green shirt.

Mr. Yellow says to them, 'Did you notice that we all are wearing different color shirts than our names?'

To this, the man who was wearing the Green shirt said. 'Wow, thats right.'

Can you identify who is wearing which colour shirt ?

As shown in the picture below, we can see a boy hanging on the tree branch to save his life. There are various ways in which he can die like1. A snake hanging toward the right waiting to bite the boy.2. A roaring Lion near the tree.3. Two crocodiles are ready to attack if the boy reaches near water. The tree is chopped to some extent, so can fall as if he moves a lot. Can you give this boy an escape plan?

who is silent in the parliament?

A boy and a girl are sitting on the porch.
"I'm a boy," says the child with black hair.
"I'm a girl," says the child with red hair.
If at least one of them is lying, who is which?

If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?