I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?

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?

The day before yesterday I was 25 and the next year I will be 28. This is true only one day in a year. What day is my birthday?

I have lakes with no water, mountains with no stone and cities with no buildings. What am I?

Can you solve the below algebraic mathematical equation?

(J+O+I+N+T)3 = JOINT

This puzzle is for Harry Potter fans. Do you know why Tom Riddle is called Lord Voldemort?

Can anyone tell me a word in the English dictionary which has a silent 'z'?

Can you start the fire using two pieces of wood?

A girl is twice as old as her brother and half as old as her father. In 50 years, her brother will be half as old as his father. How old is the daughter now?

How many triangles are there on the puzzle below?