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

What is next number in the pattern below:

131 517 192 123 ?

There are two dice with empty faces in front of you and a marker. You can mark any number on each of the faces of the two dice, but you have to display all 31 days of the month using the two of them.

Which numbers will you mark on which dice so that you can easily depict all the dates of the month?

Why are all black people so quick ?

John and Jacob are twin brothers. One of them is a liar whereas the other one is a truth-teller.

I called their home number and one of them picked up.
I asked. 'Does John lie?' The person replied with a yes.

Whom did I talk with, John or Jacob?

I am the beginning of the end, and the end of time and space. I am essential to creation, and I surround every place. What am I?

Look at this sequence from top to bottom. What is the next number in the sequence?
1
11
21
1211
111221
312211

Luis Garavito killed Density x Volume.

Who is Luis Garavito ?

Solve this riddle by finding the odd one out from the rest.

Spelt forwards I’m what you do every day, spelled backwards I’m something you hate. What am I?