What number should come in place of the question mark below?

One is to three as three is to five and five is to four and four is the magic number.
What is the pattern?

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

A brand new Mobile Phone was on sale at 20% as a promotional offer. By what per cent must the Mobile price be increased to sell it at the original price again?

Why Wine Glass Stem is so long?

Buy me, smell me or deliver me, I do not change.

Who am I?

Take away my first letter, then take away my second letter. Then take away the rest of my letters, yet I remain the same. What am I?

Akbar summoned Birbal out of anger.
He told him that he will have to face death.
He asked him to make a statement and if the statement is true he will be buried alive and if the statement is false, he will be thrown at lions.
After hearing Birbal’s statement, Akbar could do nothing but smile.
He gave him 5 gold bars and let him go.

What did Birbal say?

Who are the happiest people in IPL match?

No matter how little or how much you use me, you change me every month. What am I?