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

I’m tall when I’m young, and I’m short when I’m old. What am I?

What begins with T, ends with T, and has T in it?

Why is Saturday stronger than Monday?

A kind heart person buy packed food at 3$/packet from United states and sells them at 1$/packet at Africa. After some time he becomes a millionaire.

How come the guy become millionaire ?

What has no start, end, or centre?

Sachin bought a car with a strange 5 digit numbered plate.The water image of the number is 78633 more than my car number. All the digits of car number are distinct.

What is the original number on number plate?

People put me on the table and cut me but do not eat me. What am I?

You can win me and lose me but never buy me
You can not eat me and never want to part with me
I can make you cry or bring you joy
I am not a machine and definitely not a toy
You keep me but i am not forever just yours
You might find me in a case or on a shelf next to a vase
I am hard and i am tall if you bump me i am sure to fall
I am made of different materials and am at many events
If your lucky and fight hard I might be yours
What am I ?

I make a loud sound when I’m changing. When I do change, I get bigger but weigh less. What am I?