What has no start, end, or centre?

There are nine letters in the below-given diagram. You have to form a nine-letter word using these letters.

People are waiting in line to board a 100-seat aeroplane. Steve is the first person in the line. He gets on the plane but suddenly can't remember what his seat number is, so he picks a seat at random. After that, each person who gets on the plane sits in their assigned seat if it's available, otherwise, they will choose an open seat at random to sit in. The flight is full and you are last in line. What is the probability that you get to sit in your assigned seat?

Which alphabet is a part of our body?

What is more useful when it is broken?

O_er_t_o_

Complete the missing letters of the given word.

When my father was 31 I was 8. Now he is twice as old as me. How old am I?

You have two rectangular wires.

Both of them have property that when you light the fire from one end , it will take 60 minutes to get completely burn.

However, they do not burn at consistent speed (i.e it might be possible 1st 20% burn in 50 minutes and 80% can burn in 10 minutes).

So how could you measure 45 minutes ?

The following four words might seem abrupt to you. But you can make them meaningful by just adding vowels.
RDSH
GGPLNT
TMT
NN

Hint: All of them are vegetables.

By moving exactly three matchsticks can you make the below equation true.It can be solved by 3 ways.