How many words can a pen with half refill write?

Why 1729 is a magic number? Answer Logically.

John is the son of Jacob.
So,
Jacob is the_____of John's father?

What country can make you shiver?

One is to three as three is to five and five is to four and four is the magic number.
What is the pattern?

In the Thar desert, 3 men found a big 24L Jar is full of water. Since there is a shortage of water so they decided to distribute the water among themselves such that they all have equal amounts of it. But they only have a 13L, a 5L and an 11-litre Jar.

How do they do it?

Prove that the below maths equation is true.

8 + 8 = 91

Vin Diesel is pulling a theft and has planned to run away with all the cash kept in the safe. But the only way to open the safe is the 13 character password. He has a set of five clues given to him by a trustworthy source.

Exactly two of the below statements are false.
The password is contained within this sentence.
The password is not in this hint.
The password is within only one of these statements.
At least one of the above statements is a lie.

What 5-letter word typed in all capital letters can be read the same upside down?

How many bricks does it take to complete a building that is 15 feet wide, 30 feet deep, and 12 feet tall made of brick?