Which number should replace the question mark?

John went to meet his friend Jacob, but when he was about to reach the main gate, John notices that Jacob had a mighty dog who was fastened to the tree. The chain is long enough that it allows the dog to reach the main gate.

How can the John reach the main gate?

What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

John’s parents have three sons: Snap, Crackle, and what’s the name of the third son?

By including only four matchsticks in below picture, you have to make "Four Triangles And Two Squares"

I never stop running even when I standstill. If I am formed by joining two identical bodies together, can you guess who I am?

If Bihan is 10, Anirudha is 20, and Kim and Seal are both 5, but Rikold is 10, how much is Kenniger by the same trend?

When is the top of a mountain similar to a savings account?

What can run but never walks, has a mouth but never talks, has a head but never weeps, has a bed but never sleeps?

I am working in a bus company. The company recently went under expansion and therefore there was not enough room for all the buses. As a result, twelve buses had to be stored outside.

If the company decides to expand the garage space by forty percent, enough space to accommodate the current buses will be created leaving enough space for twelve more buses if the need arises in future.

Can you calculate the number of buses that the company owns at present?