What brings you down but never up?

What jumps when it walks and sits when it stands?

What is always in front of you but can’t be seen?

What is full of holes but still holds water?

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?

People make me, save me, change me, raise me. What am I?

What is the Surname of Barbie Doll?

If you read clockwise, you can form a word by inserting three missing letters in the picture given below. Can you do it?

No matter how little or how much you use me, you change me every month. What am I?

A new clothing store has a unique method of pricing items. A vest costs $20, a tie costs $15, a blouse costs $30, and underwear costs $45. How much would pants cost?