You are an expert on paranormal activity and have been hired to locate a spirit haunting an old resort hotel. Strong signs indicate that the spirit lies behind one of four doors. The inscriptions on each door read as follows:

Door A: It's behind B or C
Door B: Its behind A or D
Door C: It's in here
Door D: It's not in here

Your psychic powers have told you three of the inscriptions are false, and one is true. Behind which door will you find the spirit?

There are 2 people near the river and both of them want to get on the other side. The boat can only take one of them. But they got across.
How?

Suppose we lay down two cups in front of you. One of the cups is filled with tea and the other one with coffee. Now we ask you to take a spoonful of tea and mix it with the coffee. At this moment, the coffee cup has a mixture of tea and coffee. You have to take that mixture (spoonful) and add it back to the tea.

Can you now tell if the cup of coffee has more tea or the cup of tea has more coffee?

A father is locked up in jail. His wife has gone bankrupt. Their male child has to sell his hotel in order to gain some money. Yet their girl child does not care and is quite happy.

How can someone be so rude?

using four eights (8) and a one (1) and one mathematical symbol , create the number 100

I speak without a mouth, and hear without ears. I have no-body, but I come alive with the wind. What am I?

A pond had 60 fish, out of which, all but 20 died.
How many fishes are now present in that pond?

There is a square of a particular number which when doubled, becomes 7 more than its quarter.

Can you find the number?

I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?

Rectify the following equality 101 - 102 = 1 by moving just one digit.