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

What can go up a chimney down, but can’t go down a chimney up?

He runs but never walks. Murmurs, but never talks. Has a bed, but never sleeps. And has a mouth, but never eats?

How can you make number one disappear by adding something to it?

You have 10 balls with you. A friend of yours out of nowhere asks you to place those ten balls in five lines such that each of the lines has exactly 4 balls on them. He needs to check your intelligence. Prove him by doing the task.

Can you decipher the two rows to find the hidden word?

You can see it everyday, But cannot touch it at will. What is it?

Three people are in a room. Ronni looks at the Nile. The Nile looks at Senthil. Ronni is married but Senthil is not married. At any point, is a married person looking at an unmarried person? Yes, No or Cannot be determined.

I am the fastest animal but cannot climb the tree. What am I?

What you cannot hold but it is yours?