Which word does the below Plexor means ?

You walk into an old horror house. It has no power or plumbing. Once inside, you see three doors. Each door has a number on it. Behind each door is a way for you to die. Behind door number one, you die by getting eaten by a lion. Behind door number two, you die by getting murdered. Behind door number three, you die by an electric chair. You can’t turn back, so you have to go through a door. Which door do you go through?

I am looking for a word that change both gender and number when i add the letter 'S'.

What Word am I Looking For ?

John's five friends Rachel, Jacob, Phoebe, Joey and Chandler live on the same road.

Rachel lives in the house: A, Jacob lives in the house: B, Phoebe lives in the house: C, Joey lives in the house:D, Chandler lives in the house: E

Mathematically
B*C*D = 1260
B + C + D = 2E
2A = E

The road numbers run from 2 to 222.

Can you tell me the house number of each of John's friends?

Considering the below equation:

V + II - VI = 10
IV - X + VIII = 20
IV - VII + VI = 30

Then, I + II + III = ?

A man dies of old age on his 25 birthday. How is this possible?

The more of this there is, the less you see. What is it?

The dirtier I get, the whiter I look. Who am I?

A man in a car saw a Golden Door, Silver Door and a Bronze Door. What door did he open first?

John was piloting a plane behind a car but was never able to overtake it. Why?