How can you write nineteen in a manner that if we take out one, it becomes twenty?

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 is harder to catch the faster you run?

There are three houses in a straight row. One is red, one is blue, and one is white. The red house is left of the middle. The blue house is right of the middle. Where's the white house?

They are the five precious gems of an everyday sort and all can be found on a Tennis Court. Who are they?

If I put in one canary per cage, I have one bird too many. If I put in two canaries per cage, I have one cage too many. How many cages and canaries do I have?

Replace the question mark with the correct number in below Picture:

A chicken farmer has figured out that a hen and a half can lay an egg and a half in a day and a half. How many hens does the farmer need to produce one dozen eggs in six days?

They do not possess flesh or feathers or scales or bone
But still, they are blessed with fingers and thumbs of their own.

I cannot talk, but I always reply when spoken to. What am I?