Can you solve this amazing hard number series problem?
7, 8, 10, 12, 16, 18 ?

Can you count the number of triangles in the given picture?

Which letter of the alphabet has the most water?

What is the word or phrase?

A person is found murdered in his Chamber. When the crime scene is investigated, the Investigator find out that there is a calendar on which the victim has written a few numbers with his blood. The numbers are 4, 11, 11 and 4.

There are four suspects in the murder, John, Jacob, Anna and Lee. Can you find out who is the murderer?

Can you find the next number in the below sequence
3 , 7 , 10 , 11 , 12 , 17 ?

Can you name an animal whose killing cannot be performed without spilling your own blood?

A sundial has the fewest moving parts of any timepiece. Which has the most?

John Went to the nearby store in a Mall to buy something for her home. Below is the conversation between the two:

John: How much for the one?
Shopkeeper: It is $2
John: How much for the Eleven?
Shopkeeper: It is $4
John: How much for the Hundred?
Shopkeeper: It is $6.

What is John buying?

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