I have feet, but no legs. Which animal Am I?

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

P is the father of Q and S is the son of R. T is the brother of P and has a daughter U. If R is the sister of P, then what is the relation between U, Q and S?

What 8 letter word can have a letter taken away and it still makes a word. Take another letter away and it still makes a word. Keep on doing that until you have one letter left. What is the word?

What is the riddle which can be asked all day with a different correct answer each time.

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

If all Goats are Sheep and all Sheep are Deers, are all Deers Goats ?

Replace the question mark with the number below given a simple math problem.

Can you solve the maths in the below-given picture equation?

What have one eye but still cannot see?