What's the only room from which no one can enter or leave

In the image given, you can find several triangles. Can you count them all?

What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?

If in a car race, the man who came two places in front of the last man finished one ahead of the man who came fifth, how many contestants were there?

Two old friends, Jack and Bill, meet after a long time.

Three kids
Jack: Hey, how are you, man?
Bill: Not bad, got married and I have three kids now.
Jack: That's awesome. How old are they?
Bill: The product of their ages is 72 and the sum of their ages is the same as your birth date.
Jack: Cool..But I still don't know.
Bill: My eldest kid just started taking piano lessons.
Jack: Oh, now I get it.

How old are Bill's kids?

If eleven plus two equals one, what does nine plus five equal?

As easy as you can get into me, it is as hard to get out of me.

Do you know what I am?

Can you count the number of triangles in the picture below?

Which Travels Faster? Solve below famous picture riddle:

Find the smallest sentence with all the English alphabet.