Recent Riddles & Brain Teasers

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

Can you find the thief by just looking at the picture below?

Given that

(78)^9 = 6
And (69)^4 = 11

Can you find out

(99)^2 =?

(Note: This is Logical, not Mathematical)

Can you solve this amazing hard number series problem?
7, 8, 10, 12, 16, 18 ?

One day, I thought of ways that can be used for creating a palindrome. So I decided that I will turn into a larger number by adding the reversed digits to the original number and keep doing it till I finally obtained a palindrome.

I am not sure if this process will always result in a palindrome eventually but I was able to produce a four-digit palindrome. Can you guess my starting number?

There are forty elephants and they have forty-fore heads. How can this be possible?

What's the only room from which no one can enter or leave

Outside a massage parlour, there is a board that reads
"I only massage those who do not massage themselves."

Reading the above statement, does the masseur massage himself?

What has a ring but no finger?