What always comes into a house through the keyhole?

I shave every day, but my beard stays the same. What am I?

Can you find the largest Three-digit number whose sum is 14 and whose square is less than 5,00,000?

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

If,

20 % 5 = 24

21 % 7 = 33

42 % 6 = 67

Then;

66 % 6 = ?

what does this picture(rebus) riddle means ?

You need to move three matchsticks to form three squares. Can you do it?

There are nine dots in the picture that has been attached with this question. Can you join all the dots by drawing four straight lines without picking up your pen?

When my father was 31 I was 8. Now he is twice as old as me. How old am I?

Next Number in the Series,

5, 16, 49, 104, ?