Can you count the number of quadrilaterals in the picture below?

If there are fifteen crows on a fence and the farmer shoots a third of them, how many crows are left?

In the given figure, you can see that four match sticks are used to form a square. Can you form five squares by using six matches?

To attend world science seminar, A famous chemist from Mexico visit
London. In the lab, the scientist was killed and his six assistants were under suspicion of killing the chemist.
Name of six assistants: Austin, Wayne, Dege, Oscaru, Lingard, and Rojo.
He left a note "76-20-44 79-16-22-7"

A local detective Jack was called to solve the case,

After reading the note, Jack instantly asked the police to arrest the murderers.

Who are the murderers?

Sherlock Holmes was challenged to make a pre-drawn line smaller without erasing it. He did it in fractions of seconds. How?

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?

What demands an answer, but asks no questions

Can you find out the remainder when 3^300 is divided by 5?

I live in a bowl. I can swim. I have a tail. I also have fins and big eyes. What am I?

A man in a car saw a Golden Door, Silver Door and a Bronze Door. What door did he open first?