What is both possible and impossible at the same time?

A man desired to get into his work building, however he had forgotten his code.
However, he did recollect five pieces of information
* Fifth number + Third number = 14
* The fourth number is one more than the second number.
* The first number is one less than twice the second number.
* The second number and the third number equals 10.
* The sum of all five numbers is 30.

What is the code ?

Below the four parts have been reorganised. The four partitions are exactly the same in both arrangements. Why is there a hole?

A Child was born in Lahore, Pakistan.

Still child is not a Pakistani citizen.why ?

Use the digits from 1 up to 9 and make 100.

Follow the rules.
=> Each digit should be used only once.
=> You can only use addition.
=> For making a number, two single digits can be combined (for example, 4 and 2 can be combined to form 42 or 24)
=> A fraction can also be made by combining the two single digits (for example, 4 and 2 can be combined to form 4/2 or 2/4)

Question: how can we do this?

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

The doctor advised his patient to take a tablet after every fifteen minutes. He gave him five tablets in total.

How much time will he take to have all the five tablets?

If,

A + B = C
D - C = A
E - B = C

Based on the above equations, find out the answer for:

D + F = ?

I am written with two letters.
I said with the one.
I usually am seen with the two.

Who am I?

There was an aeroplane crash, every single person died, but two people survived. How is this possible?