I taste better than I can smell. Who am I?

A large container is kept in open under the rain. Every passing hour, the water collected inside the container becomes double what it was.

In ten hours, the container is filled completely. Can you calculate how long would it have taken to be filled in half?

Can you place three balls such that the equation shown in the picture holds true?

John is 45 years older than his son Jacob. If you find similarities between their ages, both of their ages contain prime numbers as the digits. Also, John's age is the reverse of Jacob's age.

Can you find their ages?

I add 5 to 9 and get 2. The answer is correct, so what am I?

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?

Get total of 120 by using five zeros 0,0,0,0,0 and any one mathematical operator.
Do you ?

I shave every day, but my beard stays the same. What am I?

Can you arrange four 9's and use at most 2 math symbols, to make the total 100?

Remove two matchsticks to make the below equation correct.