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

John went to a parrot shop in Mexico, and the parrot owner told him that his parrot is so unique that he repeats everything he hears. John got excited and immediately bought the parrot. John went home and spoke many words, but the parrot does not repeat anything.
He went again to the parrot shop and complaint to the shopkeeper, but the shopkeeper never lied. Explain?

Why is Saturday stronger than Monday?

Irene killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

John and Jacob are twin brothers. One of them is a liar whereas the other one is a truth-teller.

I called their home number and one of them picked up.
I asked. 'Does John lie?' The person replied with a yes.

Whom did I talk with, John or Jacob?

The below given figure comprises of a pattern through which you can determine the missing letter. Can you push your mind to find the pattern and add the missing letter?

A man looks at a painting in a museum and says, “Brothers and sisters I have none, but that man’s father is my father’s son.” Who is in the painting?

Which number should replace the question mark?

A Child was born in Lahore, Pakistan.

Still child is not a Pakistani citizen.why ?

A Doctor always sneezes before the rain. Doctor sneezes, Will it rain?