What number when divided in half becomes zero?

The average age of 10 members of a committee is the same as it was 4 years ago, because an old member has been replaced by a young member. Find how much younger is the new member ?

Which wheel of car does not rotate when you turn your car right?

Your last good ping-pong ball fell into a narrow metal pipe embedded one foot deep in concrete.
How can you get it out undamaged, if all the tools you have are your tennis paddle, shoe laces, and plastic water bottle, which does not fit into the pipe?

Can you count the number of triangles in the given figure?

What is the end of everything?

What 8 letter word can have a letter taken away and it still makes a word. Take another letter away and it still makes a word. Keep on doing that until you have one letter left. What is the word?

How many sides does a circle have?

Is the statement valid that it does not matter how much older a sibling is, eventually the younger one will be half as old as the older one?

Our product and our sum always give the same answer. Who are we?