Can you find the odd number in the following?

2716, 4135, 5321 and 7145

I have a five and a three-gallon jar. Assuming there is an infinite supply of water, how can I measure one-gallon water?

A word I know,
Six letters contain,
Subtract just one,
And twelve is what remains.

A wooden log balances equally on the scales when weighed with three-quarters of a pound and three-quarters of a wooden log.

Can you calculate the weight of the entire wooden log?

Count the number of squares in the picture below.

A plane crashed between the border of Mexico and America. Where do you bury the survivors?

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?

A professor thinks of two consecutive numbers between 1 and 10.
'A' knows the 1st number and 'B' knows the second number

A: I do not know your number.
B: Nor do I know your number.
A: Now I know.

What are the four solutions for this?

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

Can you move 2 matchsticks to form four equal sized squares.