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

Imagine you are in a room with no windows or doors. How will you get out?

I know a nine-letter word having only one vowel.
Do you ?

Can you spot what's wrong with the following sentence?

PETER WAS ANGRY AT
HIMSELF BECAUSE HE
ACCIDENTALLY LEFT THE
THE KEYS TO HIS CAR
AT HIS FRIEND'S HOUSE.

What word begins and ends with an E, but has only one letter?

Make eight squares by moving only two matchsticks.
Note- Square can be of different sizes.

A game is being played where eight players can last for thirty-five minutes. Six substitutes alternate with each player in this game. Thus, all players are on the pitch for the same amount of time including the substitutes.

For how long is each player on the pitch?

The doctor advised his patient to take a tablet after every fifteen minutes. He gave him five tablets in total.

How much time will he take to have all the five tablets?

Solve The below Equation:

ALFA + BETA + GAMA = DELTA

You knock a Table over in the library, and suddenly 20 eyes are looking at you.