Find the next number in the sequence

1, 2, 6, 21, 88, __?

Find the smallest sentence with all the English alphabet.

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

He digs out tiny caves and stores gold and silver in them. He also built bridges of silver and made crowns of gold. They are the smallest you could imagine. Sooner or later everybody needs his help, yet many people are afraid to let him help them. Who is he?

Astrology starts with the alphabet A, Biology starts with B, Psychology with P and Limnology with L.

Can you find an "ology" that begins with a P?

What is the word or phrase below?
R | E | A | D

Bopanna was working on a murder case when he received a message about the location of the murder weapon.
The message was encrypted as below.

"deb mitciv eht edisni neddih si nopaew redrum ehT"

Tell me the location of the murder weapon.

In a boat, the father of a sailor's son is sitting with the son of the sailor. However, the sailor is not present on the boat.

Can this even be possible?

The day after tomorrow will be three days before Tuesday. Can you find out what is today?

I cannot talk, but I always reply when spoken to. What am I?