What is the longest word in the dictionary?

John was running from 40 thieves. John has got 3 gold boxes which weigh as 4kg, 2kg, and 1kg respectively. A witty man asked John to stay with him for seven days in exchange for 1kg gold per day. John needs to stay there for seven days and also do not want to give the witty man any advance. How can John pay for his seven days stay?

I am looking for a word that change both gender and number when i add the letter 'S'.

What Word am I Looking For ?

Why do you find that most of the buildings are deprived of the 13th floor?

What has a bottom at the top?

What two things can you never eat for breakfast?

What does this mathematical rebus means ?

I add 5 to 9 and get 2. The answer is correct, so what am I?

Why is Saturday stronger than Monday?

Two natural numbers have a sum of less than 100 and are greater than one.

John knows the product of the numbers and Jacob knows the sum of numbers.

The following conversation takes place between them:
John: 'I am not aware of those numbers.'
Jacob: 'I knew you wouldn't be. I am not aware myself.'
John: 'Now I know them!'
Jacob: 'Now I know them, too!'

What are the two numbers?