What does this mathematical rebus means ?

How many letters are in the alphabet?

Find out which of the given views in the picture is accurately the top view of the given pyramid.

What can run but never walk, have a mouth that never speaks, have a head that never weeps, and have a bed but never sleeps?

81 x 9 = 801. What must you do to make the this equation true?

Find three numbers such that

* When we multiply three numbers, we will get the prime numbers.
* The difference between the second and the first number is equal to the third and second.

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?

Find the missing number in the image below.

Can you replace the question mark with the correct letter?

6 + 6 + 6 = N
7 + 7 + 7 = E
8 + 8 + 8 = R
0 + 0 + 0 = ?

What number do you get when you multiply all of the numbers on a telephone's number pad?