What is the next number in this matchsticks series riddle?

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

Count The number of F's in the paragraph below:

"FINISHED FILES ARE THE RESULT OF YEARS OF SCIENTIFIC STUDY COMBINED WITH THE EXPERIENCE OF YEARS"

I look flat, but I am deep. Hidden realms I shelter. Lives I take, but the food I offer. At times I am beautiful. I can be calm, angry, and turbulent. I have no heart but offer pleasure as well as death. No man can own me, yet I encompass what all men must have. What am I?

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

In the given figure, you can see that four match sticks are used to form a square. Can you form five squares by using six matches?

I am a number I am not an odd number I am higher than 90 I am not higher than 100 If you subtract me from 100, you get nothing. What number am I?

What came first, the chicken or the egg?

How can I get the answer 24 by only using the numbers 8,8,3,3?

You can use the main signs add, subtract multiply and divide.

What word is represented by this rebus?