Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

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

In the figure that has been attached to this question, each digit represents a digit. The similar letters carry the same integer value. Can you expose the original digits?

A detective visits his friend John just to discover that John's neighbour Dr Jacob was murdered. Dr Jacob, who is a mathematician wrote the murderer's name in a code word "Hcqtfz". There were five suspects
1. Ajit
2. Pankaj
3. Ganpat
4. Deenu
5. Hariya

The Detective was instantly able to find the murderer.
Can you?

What came first, the chicken or the egg?

What is the longest word in the dictionary?

A mile-long train is moving at sixty miles an hour when it reaches a mile-long tunnel. How long does it take the entire train to pass through the tunnel?

Two in a corner, one in a room, zero in a house, but one in a shelter. What is it?

Why is a river so rich ?

John replied, when asked how old he was. In 2 years he will be twice as old as he was five years ago.' How old is he ?