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

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

There are two dice with empty faces in front of you and a marker. You can mark any number on each of the faces of the two dice, but you have to display all 31 days of the month using the two of them.

Which numbers will you mark on which dice so that you can easily depict all the dates of the month?

How can you write nineteen in a manner that if we take out one, it becomes twenty?

Get total of 120 by using five zeros 0,0,0,0,0 and any one mathematical operator.
Do you ?

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

A train leaves from point A for point B at 80 mph. After half an hour, another train leaves from point B for point A at 60 mph.

Which of the trains will be farther from point A when they meet ?

Can you make a six-letter word using the letters N, A and B ?

A bag contains 64 balls of eight different colours. There are eight of each colour (including red). What is the least number you would have to pick, without looking, to be sure of selecting 3 red balls?

A word I know has six letters it contains, remove one letter and 12 remain. What is it?