What has one letter and starts with an E?

Can you find out the missing number in the grid?

If 2 workers can complete painting 2 walls in exactly 2 hours.

How many workers would be needed to paint 18 walls in 6 hours?

No one wants to have it, but if one got it, he does not want to lose it. What is It?

A woman lives in a Tall building thirty-six floors high and served by several elevators which stop at each floor going up and down. Each morning she leaves her apartment and goes to one of the elevators. Whichever one she takes is three times more likely to be going up than down. Why?

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

What has 13 hearts but no other organs?

Decode the below four famous ciphers:

8P of the SS
1M of the E
1S of the SS
60M in 1H

If,
29 - 1 = 30
9 - 1 = 10
14 - 1 = 15

Based on similar logic, Can you prove that the below algebraic equation is true?
11 - 1 = 10 ?

Andrew sees a very rare bird named "Ruppell's vulture". Soon Andrew was dead. Can you explain the mystery, Mr. Sherlock?