Can you solve this picture maths equation?

Can you replace the question mark with the correct number?

How can one talk without saying a single word?

How can you drop a raw egg from a height onto a concrete floor without cracking it?

John is now two fifth of his older brother's age and two years from now he will be half of his older brother's age.
Two years ago, John was only one-fourth the age of his older brother age at that time.

How old is John now?

Luis Garavito killed Density x Volume.

Who is Luis Garavito ?

What is the difference between a jeweller and a jailer?

How do you go from 98 to 720 using just one letter?

At a party, there are five people and a whole round cake lying at the centre of the table. Only four people will make a cut and take their piece and the last one will get the remaining piece on the table. How can they make sure that everyone gets a 1/5th of the piece?

If a wheel has 54 spokes, how many spaces are there between the spokes?