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

In 1990, a person is 15 years old. In 1995, that same person is 10 years old. How can this be?

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?

What goes up but never comes down?

I have eight fingers and two thumbs but I do not live. What Am I?

Things are just as they seem, right? Well, check again.
Can you count the number of tigers in this picture ?

What question can you never answer yes to?

What is the fastest way to double your money?

A doctor and a boy were fishing. The boy was the doctor’s son, but the doctor was not the boy’s father. Who was the doctor?

In a fruit store, there was a unique weighing machine that was made to weigh only cherries and strawberries as they were priced the same.

Other fruits like watermelons or mango had different machines as they were expensive.

A man successfully buys watermelons at the price of cherries. How?