What occurs twice in a week, once in a year but never in a day?

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?

A man wants to cross the pit of fire which is 25 feet in length and he has 2 planks(fire resistant) 19 feet in length. How can he cross the pit of fire alive?

In the image below, can you find the value of an angle(y)

How can you spell "White of an egg" in one word?
Hint: I know you can spell coke, poke, and joke.

What is the end of everything?

Find the last number in the series below:

voN luJ yaM raM ---

Why is the Hole below a Lock?

Take away my first letter, then take away my second letter. Then take away the rest of my letters, yet I remain the same. What am I?

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