What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see?

If we add four times the age of John four years from now to five times his age five years from now we get ten times his current age.

How old will John be two years from now?

Today, I celebrated my 32nd birthday but I was born in 1972.
How is this possible?

The person who makes it has no need for it; the person who buys it has no use for it. The person who uses it can neither see nor feel it. What is it?

Why is the Hole below a Lock?

What part of Turkey has the most feathers?

When 99 is considered higher than 100?

I get hot but I never sweat,
I cook food but I am not a chef,
I have a door but you can't enter me,
I have a light but I am not a lamp.
Who am I?

How many people must be gathered together in a room, before you can be certain that there is a greater than 50/50 chance that at least two of them have the same birthday?

How many triangles are there in the picture below?